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Fair Values of Financial Instruments (Details Textual) (USD $)
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Dec. 31, 2014
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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 | $ 3,900,000us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 3,900,000us-gaap_AvailableForSaleSecuritiesAmortizedCost |
| Unpaid Principal Balance | 7,300,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance | 9,900,000us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance |
| Impaired Financing Receivable, Reserve | 426,000nwin_ImpairedFinancingReceivableReserve | 1,700,000nwin_ImpairedFinancingReceivableReserve |
| Impaired Financing Receivable, Fair Value | $ 6,900,000nwin_ImpairedFinancingReceivableFairValue | $ 8,200,000nwin_ImpairedFinancingReceivableFairValue |
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- Details
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- Definition
The fair value of investment related to impaired financing receivables. No definition available.
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- Definition
The carrying amount of reserve related to impaired financing receivable. No definition available.
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- Definition
Maximum range percentage of defaults rates on above 3 years issuer average in other than temporary impairment model assumptions. No definition available.
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- Definition
Maximum range percentage of recovery assumptions in other than temporary impairment model assumptions. No definition available.
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- Definition
Minimum range percentage of defaults rates on above 3 years issuer average in other than temporary impairment model assumptions. No definition available.
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- Definition
Minimum range percentage of recovery assumptions in other than temporary impairment model assumptions. No definition available.
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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