Annual report pursuant to Section 13 and 15(d)

Loans Receivable (Details 3)

v2.4.1.9
Loans Receivable (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Residential Real Estate Including Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 685us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember 		$ 887us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
Unpaid Principal Balance 1,258us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember 		899us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
Related Allowance 15us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember 		16us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
Average Recorded Investment 703us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember 		920us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
Interest Income Recognized 6us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember 		9us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 6,240us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember 		8,446us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Unpaid Principal Balance 7,476us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember 		8,446us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Related Allowance 366us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember 		1,657us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Average Recorded Investment 6,616us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember 		9,668us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Interest Income Recognized 215us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember 		83us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Commercial Participations Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 103us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember 		0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
Unpaid Principal Balance 103us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember 		0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
Related Allowance 11us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember 		0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
Average Recorded Investment 103us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember 		0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
Interest Income Recognized 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember 		0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 328us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		534us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Unpaid Principal Balance 596us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		802us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Related Allowance 34us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		30us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Average Recorded Investment 333us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		1,122us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Interest Income Recognized 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember 		2us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Impaired Loans With No Related Allowance [Member] | Residential Real Estate Including Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Unpaid Principal Balance 0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Related Allowance 0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Average Recorded Investment 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Interest Income Recognized 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Impaired Loans With No Related Allowance [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 524us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		617us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Unpaid Principal Balance 524us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		617us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Related Allowance 0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Average Recorded Investment 527us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		898us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Interest Income Recognized 22us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		9us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Impaired Loans With No Related Allowance [Member] | Commercial Participations Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Unpaid Principal Balance 0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Related Allowance 0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Average Recorded Investment 0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Interest Income Recognized 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Impaired Loans With No Related Allowance [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 25us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		228us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Unpaid Principal Balance 25us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		228us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Related Allowance 0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Average Recorded Investment 25us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		668us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Interest Income Recognized 0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember 		1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithNoRelatedAllowanceMember
Impaired Loans With Related Allowance [Member] | Residential Real Estate Including Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 685us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		887us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Unpaid Principal Balance 1,258us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		899us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Related Allowance 15us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		16us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Average Recorded Investment 703us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		920us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Interest Income Recognized 6us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		9us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_ResidentialRealEstateIncludingHomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Impaired Loans With Related Allowance [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 5,716us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		7,829us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Unpaid Principal Balance 6,952us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		7,829us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Related Allowance 366us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		1,657us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Average Recorded Investment 6,089us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		8,770us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Interest Income Recognized 193us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		74us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Impaired Loans With Related Allowance [Member] | Commercial Participations Purchased [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 103us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Unpaid Principal Balance 103us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Related Allowance 11us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Average Recorded Investment 103us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Interest Income Recognized 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		0us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= nwin_CommercialParticipationsPurchasedMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Impaired Loans With Related Allowance [Member] | Commercial Loan [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 303us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		306us-gaap_ImpairedFinancingReceivableRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Unpaid Principal Balance 571us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		574us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Related Allowance 34us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		30us-gaap_ImpairedFinancingReceivableRelatedAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Average Recorded Investment 308us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		454us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember
Interest Income Recognized $ 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember 		$ 1us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nwin_ImpairedLoansWithRelatedAllowanceMember