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Loans Receivable (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Individually Evaluated for Impairment | $ 9,867 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 6,768 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Land, Buildings and Improvements [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Recorded Investment | 707 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandBuildingsAndImprovementsMember |
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Individually Evaluated for Impairment |  | 588 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember
Financing Receivable, Modifications, Recorded Investment | 106 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember |
Impaired Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Impaired Financing Receivable, Unpaid Principal Balance, Total |  | 1,300 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_InvestmentTypeAxis = nwin_ImpairedLoansMember
Residential Real Estate Including Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 792 us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 770 us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember |
Impaired Financing Receivable, Unpaid Principal Balance, Total | 899 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,258 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Financing Receivable, Individually Evaluated for Impairment | $ 887 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | $ 97 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember

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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
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