Annual report pursuant to Section 13 and 15(d)

Fair Values of Financial Instruments (Details 4)

v2.4.1.9
Fair Values of Financial Instruments (Details 4) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Impaired Loans [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 6,930us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember 		$ 8,164us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember
Foreclosed Real Estate [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 1,745us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember 		1,084us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember 		0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember
Fair Value, Inputs, Level 1 [Member] | Foreclosed Real Estate [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember 		0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember 		0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember
Fair Value, Inputs, Level 2 [Member] | Foreclosed Real Estate [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember 		0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 6,930us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember 		8,164us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ImpairedLoansMember
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member]
    
Fair Value Asset Measured On Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring $ 1,745us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember 		$ 1,084us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_InvestmentTypeAxis
= nwin_ForeclosedRealEstateMember