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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets: |  |
Bad debts | $ 2,372 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses | $ 2,754 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses
Deferred loan fees | 73 nwin_DeferredTaxAssetsTaxDeferredLoanFees | 96 nwin_DeferredTaxAssetsTaxDeferredLoanFees
Deferred compensation | 484 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 483 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Unrealized depreciation on securities available-for-sale, net | 0 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross | 1,620 us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross
Net operating loss, state | 557 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 642 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credits | 85 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 78 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Nonaccrual loan interest income | 62 nwin_DeferredTaxAssetsNonaccrualLoanInterestIncome | 87 nwin_DeferredTaxAssetsNonaccrualLoanInterestIncome
Restricted stock awards | 43 nwin_DeferredTaxAssetsRestrictedStockAward | 35 nwin_DeferredTaxAssetsRestrictedStockAward
REO writedowns | 24 nwin_DeferredTaxAssetsRealEstateOwnedWritedowns | 25 nwin_DeferredTaxAssetsRealEstateOwnedWritedowns
Unqualified deferred compensation plan | 63 nwin_DeferredTaxAssetsUnqualifiedDcp | 60 nwin_DeferredTaxAssetsUnqualifiedDcp
Post retirement benefit | 52 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits | 52 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Other-than-temporary impairment | 92 nwin_DeferredTaxAssetsOtherThanTemporaryImpairment | 92 nwin_DeferredTaxAssetsOtherThanTemporaryImpairment
Accrued vacation | 98 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 111 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Impairment on land | 71 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses | 75 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
Purchase accounting | 47 nwin_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPurchaseAccounting | 0 nwin_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsPurchaseAccounting
Other | 1 us-gaap_DeferredTaxAssetsOther | 19 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 4,124 us-gaap_DeferredTaxAssetsGross | 6,229 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities: |  |
Depreciation | (1,034)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (1,232)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaids | (337)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses | (270)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Mortgage servicing rights | (79)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights | (105)us-gaap_DeferredTaxLiabilitiesMortgageServicingRights
Deferred stock dividends | (109)nwin_DeferredTaxLiabilitiesDeferredStockDividends | (112)nwin_DeferredTaxLiabilitiesDeferredStockDividends
Unrealized appreciation on securities available-for-sale, net | (826)us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities | 0 us-gaap_DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities
Post retirement unrealized gain | (23)nwin_DeferredTaxLiabilitiesPostRetirementUnrealizedGain | (42)nwin_DeferredTaxLiabilitiesPostRetirementUnrealizedGain
Other | (105)us-gaap_DeferredTaxLiabilitiesOther | (83)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | (2,513)us-gaap_DeferredIncomeTaxLiabilities | (1,844)us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance | (257)us-gaap_DeferredTaxAssetsValuationAllowance | (288)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset | $ 1,354 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 4,097 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated impairment losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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