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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | $ 39,922 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates | $ 35,189 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates
Loans and Leases Receivable, Commitments, Variable Rates | 52,814 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates | 43,572 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates
Loans And Leases Receivable Commitments | 92,736 nwin_LoansAndLeasesReceivableCommitments | 78,761 nwin_LoansAndLeasesReceivableCommitments
Consumer Loan [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | 11,037 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 10,734 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Loans and Leases Receivable, Commitments, Variable Rates | 0 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Loans And Leases Receivable Commitments | 11,037 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 10,734 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Commercial Real Estate [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | 8,534 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 6,718 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Loans and Leases Receivable, Commitments, Variable Rates | 6,842 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 0 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Loans And Leases Receivable Commitments | 15,376 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 6,718 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Commercial Participations Purchased [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | 83 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 1,293 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Loans and Leases Receivable, Commitments, Variable Rates | 0 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 5,522 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Loans And Leases Receivable Commitments | 83 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 6,815 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Residential Real Estate Including Home Equity [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | 19,010 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 14,716 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Loans and Leases Receivable, Commitments, Variable Rates | 6,052 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 8,768 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Loans And Leases Receivable Commitments | 25,062 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 23,484 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Commercial business [Member] |  |
Commitments and Contingencies [Line Items] |  |
Loans and Leases Receivable, Commitments, Fixed Rates | 1,258 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialBusinessMember | 1,728 us-gaap_LoansAndLeasesReceivableCommitmentsFixedRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialBusinessMember
Loans and Leases Receivable, Commitments, Variable Rates | 39,920 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialBusinessMember | 29,282 us-gaap_LoansAndLeasesReceivableCommitmentsVariableRates / us-gaap_FinancialInstrumentAxis = nwin_CommercialBusinessMember
Loans And Leases Receivable Commitments | $ 41,178 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = nwin_CommercialBusinessMember | $ 31,010 nwin_LoansAndLeasesReceivableCommitments / us-gaap_FinancialInstrumentAxis = nwin_CommercialBusinessMember

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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at stated interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788 + Details
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- Definition Reflects the amount of cash required to fully fund agreements to provide advances to borrowers and lessees at interest rates that increase or decrease depending on certain facts or circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788 + Details
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