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Fair Values of Financial Instruments (Details Textual) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value [Line Items] |  |
Minimum Percentage of Defaults Rates on Above 3 Years Issuer Average in Other than Temporary Impairment Model Assumptions | 0.25%nwin_MinimumPercentageOfDefaultsRatesOnAbove3YearsIssuerAverageInOtherThanTemporaryImpairmentModelAssumptions |
Maximum Percentage of Defaults Rates on Above 3 Years Issuer Average in Other than Temporary Impairment Model Assumptions | 5.00%nwin_MaximumPercentageOfDefaultsRatesOnAbove3YearsIssuerAverageInOtherThanTemporaryImpairmentModelAssumptions |
Minimum Percentage of Recovery Assumptions on Other than Temporary Impairment Model Assumptions | 0.00%nwin_MinimumPercentageOfRecoveryAssumptionsOnOtherThanTemporaryImpairmentModelAssumptions |
Maximum Percentage of Recovery Assumptions on Other than Temporary Impairment Model Assumptions | 15.00%nwin_MaximumPercentageOfRecoveryAssumptionsOnOtherThanTemporaryImpairmentModelAssumptions |
Available-for-sale Securities, Amortized Cost Basis | $ 3,900,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 3,900,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Unpaid Principal Balance | 7,300,000 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | 9,900,000 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Impaired Financing Receivable, Reserve | 426,000 nwin_ImpairedFinancingReceivableReserve | 1,700,000 nwin_ImpairedFinancingReceivableReserve
Impaired Financing Receivable, Fair Value | $ 6,900,000 nwin_ImpairedFinancingReceivableFairValue | $ 8,200,000 nwin_ImpairedFinancingReceivableFairValue

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- Definition The fair value of investment related to impaired financing receivables. + References No definition available. + Details
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- Definition The carrying amount of reserve related to impaired financing receivable. + References No definition available. + Details
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- Definition Maximum range percentage of defaults rates on above 3 years issuer average in other than temporary impairment model assumptions. + References No definition available. + Details
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- Definition Maximum range percentage of recovery assumptions in other than temporary impairment model assumptions. + References No definition available. + Details
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- Definition Minimum range percentage of defaults rates on above 3 years issuer average in other than temporary impairment model assumptions. + References No definition available. + Details
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- Definition Minimum range percentage of recovery assumptions in other than temporary impairment model assumptions. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Unpaid principal balance of impaired financing receivables for which there is a 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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