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Loans Receivable (Details Textual) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Individually Evaluated for Impairment | $ 5,912 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 6,768 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Financing Receivable, Individually Evaluated for Impairment | 929 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_ResidentialRealEstateMember |
Impaired Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Impaired Financing Receivable, Unpaid Principal Balance, Total | 1,900 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_InvestmentTypeAxis = nwin_ImpairedLoansMember |
Residential Real Estate Including Home Equity [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Impaired Financing Receivable, Unpaid Principal Balance, Total | 2,269 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,258 us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Financing Receivable, Individually Evaluated for Impairment | $ 336 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 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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