Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Textual)

v2.4.1.9
Commitments and Contingencies (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies [Line Items]    
Loans and Leases Receivable, Commitments, Fixed Rates $ 39,922,000us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates $ 35,189,000us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
Standby Letters of Credit [Member]    
Commitments and Contingencies [Line Items]    
Letters of Credit Outstanding, Amount $ 7,900,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_StandbyLettersOfCreditMember 		$ 8,200,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_InvestmentTypeAxis
= us-gaap_StandbyLettersOfCreditMember
Minimum [Member]    
Commitments and Contingencies [Line Items]    
Loans Receivable Fixed Rates Of Interest 1.49%nwin_LoansReceivableFixedRatesOfInterest
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		2.30%nwin_LoansReceivableFixedRatesOfInterest
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]    
Commitments and Contingencies [Line Items]    
Loans Receivable Fixed Rates Of Interest 10.00%nwin_LoansReceivableFixedRatesOfInterest
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		10.00%nwin_LoansReceivableFixedRatesOfInterest
/ us-gaap_RangeAxis
= us-gaap_MaximumMember