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Loans Receivable (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Allowance for loan losses: |  |
Beginning Balance | $ 7,189 us-gaap_LoansAndLeasesReceivableAllowance | $ 8,421 us-gaap_LoansAndLeasesReceivableAllowance
Charge-offs | (1,764)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs | (1,857)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Recoveries | 61 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts | 175 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts
Provisions | 875 us-gaap_ProvisionForLoanAndLeaseLosses | 450 us-gaap_ProvisionForLoanAndLeaseLosses
Ending Balance | 6,361 us-gaap_LoansAndLeasesReceivableAllowance | 7,189 us-gaap_LoansAndLeasesReceivableAllowance
Ending balance: individually evaluated for impairment | 426 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 | 1,703 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Ending balance: collectively evaluated for impairment | 5,935 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment | 5,486 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
LOAN RECEIVABLES |  |
Ending balance | 488,153 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 437,821 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Ending balance: individually evaluated for impairment | 6,768 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | 9,867 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Ending balance: purchased credit impaired individually evaluated for impairment | 588 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment |
Ending balance: collectively evaluated for impairment | 480,797 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 427,954 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Residential Real Estate Including Home Equity [Member] |  |
Allowance for loan losses: |  |
Beginning Balance | 1,444 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,024 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Charge-offs | (311)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | (153)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Recoveries | 20 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Provisions | 725 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 572 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Ending Balance | 1,878 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,444 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Ending balance: individually evaluated for impairment | 15 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 16 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Ending balance: collectively evaluated for impairment | 1,863 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 1,428 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
LOAN RECEIVABLES |  |
Ending balance | 189,529 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 161,664 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Ending balance: individually evaluated for impairment | 97 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 887 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Ending balance: purchased credit impaired individually evaluated for impairment | 588 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember |
Ending balance: collectively evaluated for impairment | 188,844 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 160,777 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Consumer Loan [Member] |  |
Allowance for loan losses: |  |
Beginning Balance | 12 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 19 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Charge-offs | (32)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | (17)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Recoveries | 1 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 5 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Provisions | 36 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 5 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Ending Balance | 17 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 12 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Ending balance: individually evaluated for impairment | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Ending balance: collectively evaluated for impairment | 17 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 12 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
LOAN RECEIVABLES |  |
Ending balance | 357 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 232 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Ending balance: individually evaluated for impairment | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Ending balance: purchased credit impaired individually evaluated for impairment | 0 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember |
Ending balance: collectively evaluated for impairment | 357 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 232 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Commercial Real Estate [Member] |  |
Allowance for loan losses: |  |
Beginning Balance | 4,789 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 4,550 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Charge-offs | (1,421)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | (788)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Recoveries | 17 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 9 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Provisions | 260 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,018 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Ending Balance | 3,645 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 4,789 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Ending balance: individually evaluated for impairment | 366 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 1,657 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Ending balance: collectively evaluated for impairment | 3,279 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 3,132 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
LOAN RECEIVABLES |  |
Ending balance | 211,162 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 195,349 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Ending balance: individually evaluated for impairment | 6,240 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 8,446 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Ending balance: purchased credit impaired individually evaluated for impairment | 0 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember |
Ending balance: collectively evaluated for impairment | 204,922 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember | 186,903 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialRealEstateMember
Commercial Participations Purchased [Member] |  |
Allowance for loan losses: |  |
Beginning Balance | 31 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 1,608 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Charge-offs | 0 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | (332)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Recoveries | 2 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 137 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Provisions | (20)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | (1,382)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Ending Balance | 13 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 31 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Ending balance: individually evaluated for impairment | 11 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Ending balance: collectively evaluated for impairment | 2 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 31 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
LOAN RECEIVABLES |  |
Ending balance | 2,289 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 1,273 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Ending balance: individually evaluated for impairment | 103 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Ending balance: purchased credit impaired individually evaluated for impairment | 0 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember |
Ending balance: collectively evaluated for impairment | 2,186 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember | 1,273 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = nwin_CommercialParticipationsPurchasedMember
Commercial Loan [Member] |  |
Allowance for loan losses: |  |
Beginning Balance | 859 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 1,220 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Charge-offs | 0 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | (567)us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Recoveries | 21 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 23 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Provisions | (147)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 183 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending Balance | 733 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 859 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending balance: individually evaluated for impairment | 34 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 30 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending balance: collectively evaluated for impairment | 699 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 829 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
LOAN RECEIVABLES |  |
Ending balance | 58,682 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 57,716 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending balance: individually evaluated for impairment | 328 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 534 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Ending balance: purchased credit impaired individually evaluated for impairment | 0 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember |
Ending balance: collectively evaluated for impairment | 58,354 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 57,182 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Government [Member] |  |
Allowance for loan losses: |  |
Beginning Balance | 54 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Charge-offs | 0 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Recoveries | 0 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_AllowanceForLoanAndLeaseLossRecoveryOfBadDebts / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Provisions | 21 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 54 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Ending Balance | 75 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 54 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Ending balance: individually evaluated for impairment | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1 / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Ending balance: collectively evaluated for impairment | 75 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 54 us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
LOAN RECEIVABLES |  |
Ending balance | 26,134 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 21,587 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Ending balance: individually evaluated for impairment | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | 0 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember
Ending balance: purchased credit impaired individually evaluated for impairment | 0 nwin_FinancingReceivablePurchasedCreditImpairedIndividuallyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember |
Ending balance: collectively evaluated for impairment | $ 26,134 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember | $ 21,587 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis = us-gaap_GovernmentMember

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- Definition The balance of financing receivables that were purchased credit impaired individually evaluated for impairment. + References No definition available. + Details
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Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively 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 (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible 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 (g) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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