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Fair Value (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Number | Mar. 31, 2015
Other-than-temporary impairment model assumptions: |  |  |
Other-than-temporary impairment | $ 271 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld |  | $ 271 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Cusip One [Member] |  |  |
Fair Value Pooled Trust Preferred Securities [Line Items] |  |  |
Cusip | 74043CAC1 |  |
Deal name | PreTSL XXIV |  |
Class | B-1 |  |
Lowest credit rating assigned | CC |  |
Number of performing banks | 52 nwin_NumberOfPerformingBanksUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipOneMember |  |
Number of performing insurance companies | 13 nwin_NumberOfPerformingInsuranceCompaniesUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipOneMember |  |
Number of issuers in default | 20 nwin_NumberOfIssuersInDefaultUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipOneMember |  |
Number of issuers in deferral | 8 nwin_NumberOfIssuersInDeferralUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipOneMember |  |
Defaults & deferrals as a % of performing collateral | 47.64%nwin_PercentageOfDefaultsAndDeferralsOnPerformingCollateral / nwin_CusipAxis = nwin_CusipOneMember |  |
Subordination: |  |  |
As a % of performing collateral | 2.10%nwin_PercentageOfSubordinationOnPerformingCollateral / nwin_CusipAxis = nwin_CusipOneMember |  |
As a % of performing collateral - adjusted for projected future defaults | (3.49%)nwin_PercentageOfSubordinationOnPerformingCollateralAdjustedForProjectedFutureDefaults / nwin_CusipAxis = nwin_CusipOneMember |  |
Other-than-temporary impairment model assumptions: |  |  |
Year 1 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear1IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipOneMember |  |
Year 2 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear2IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipOneMember |  |
Year 3 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear3IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipOneMember |  |
> 3 Years - issuer average |  | [1] |
Discount rate - 3 month Libor, plus implicit yield spread at purchase | 1.48%nwin_PercentageOfDiscountRateOn3MonthLiborPlusImplicitYieldSpread / nwin_CusipAxis = nwin_CusipOneMember |  |
Recovery assumptions |  | [2] |
Prepayments | 0.00%nwin_PercentageOfPrepaymentsOnOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipOneMember |  |
Other-than-temporary impairment | 41 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld / nwin_CusipAxis = nwin_CusipOneMember |  |
Cusip Two [Member] |  |  |
Fair Value Pooled Trust Preferred Securities [Line Items] |  |  |
Cusip | 74042TAJ0 |  |
Deal name | PreTSL XXVII |  |
Class | C-1 |  |
Lowest credit rating assigned | C |  |
Number of performing banks | 29 nwin_NumberOfPerformingBanksUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipTwoMember |  |
Number of performing insurance companies | 7 nwin_NumberOfPerformingInsuranceCompaniesUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipTwoMember |  |
Number of issuers in default | 9 nwin_NumberOfIssuersInDefaultUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipTwoMember |  |
Number of issuers in deferral | 4 nwin_NumberOfIssuersInDeferralUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipTwoMember |  |
Defaults & deferrals as a % of performing collateral | 31.32%nwin_PercentageOfDefaultsAndDeferralsOnPerformingCollateral / nwin_CusipAxis = nwin_CusipTwoMember |  |
Subordination: |  |  |
As a % of performing collateral | (6.95%)nwin_PercentageOfSubordinationOnPerformingCollateral / nwin_CusipAxis = nwin_CusipTwoMember |  |
As a % of performing collateral - adjusted for projected future defaults | (15.25%)nwin_PercentageOfSubordinationOnPerformingCollateralAdjustedForProjectedFutureDefaults / nwin_CusipAxis = nwin_CusipTwoMember |  |
Other-than-temporary impairment model assumptions: |  |  |
Year 1 - issuer average | 2.40%nwin_PercentageOfDefaultsRatesOnYear1IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipTwoMember |  |
Year 2 - issuer average | 2.40%nwin_PercentageOfDefaultsRatesOnYear2IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipTwoMember |  |
Year 3 - issuer average | 2.40%nwin_PercentageOfDefaultsRatesOnYear3IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipTwoMember |  |
> 3 Years - issuer average |  | [1] |
Discount rate - 3 month Libor, plus implicit yield spread at purchase | 1.23%nwin_PercentageOfDiscountRateOn3MonthLiborPlusImplicitYieldSpread / nwin_CusipAxis = nwin_CusipTwoMember |  |
Recovery assumptions |  | [2] |
Prepayments | 0.00%nwin_PercentageOfPrepaymentsOnOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipTwoMember |  |
Other-than-temporary impairment | 132 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld / nwin_CusipAxis = nwin_CusipTwoMember |  |
Cusip Three [Member] |  |  |
Fair Value Pooled Trust Preferred Securities [Line Items] |  |  |
Cusip | 01449TAB9 |  |
Deal name | Alesco IX |  |
Class | A-2A |  |
Lowest credit rating assigned | BB |  |
Number of performing banks | 57 nwin_NumberOfPerformingBanksUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipThreeMember |  |
Number of performing insurance companies | 10 nwin_NumberOfPerformingInsuranceCompaniesUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipThreeMember |  |
Number of issuers in default | 1 nwin_NumberOfIssuersInDefaultUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipThreeMember |  |
Number of issuers in deferral | 8 nwin_NumberOfIssuersInDeferralUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipThreeMember |  |
Defaults & deferrals as a % of performing collateral | 11.17%nwin_PercentageOfDefaultsAndDeferralsOnPerformingCollateral / nwin_CusipAxis = nwin_CusipThreeMember |  |
Subordination: |  |  |
As a % of performing collateral | 44.19%nwin_PercentageOfSubordinationOnPerformingCollateral / nwin_CusipAxis = nwin_CusipThreeMember |  |
As a % of performing collateral - adjusted for projected future defaults | 41.00%nwin_PercentageOfSubordinationOnPerformingCollateralAdjustedForProjectedFutureDefaults / nwin_CusipAxis = nwin_CusipThreeMember |  |
Other-than-temporary impairment model assumptions: |  |  |
Year 1 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear1IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipThreeMember |  |
Year 2 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear2IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipThreeMember |  |
Year 3 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear3IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipThreeMember |  |
> 3 Years - issuer average |  | [1] |
Discount rate - 3 month Libor, plus implicit yield spread at purchase | 1.27%nwin_PercentageOfDiscountRateOn3MonthLiborPlusImplicitYieldSpread / nwin_CusipAxis = nwin_CusipThreeMember |  |
Recovery assumptions |  | [2] |
Prepayments | 0.00%nwin_PercentageOfPrepaymentsOnOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipThreeMember |  |
Other-than-temporary impairment | 36 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld / nwin_CusipAxis = nwin_CusipThreeMember |  |
Cusip Four [Member] |  |  |
Fair Value Pooled Trust Preferred Securities [Line Items] |  |  |
Cusip | 01450NAC6 |  |
Deal name | Alesco XVII |  |
Class | B |  |
Lowest credit rating assigned | Ca |  |
Number of performing banks | 47 nwin_NumberOfPerformingBanksUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipFourMember |  |
Number of performing insurance companies | 0 nwin_NumberOfPerformingInsuranceCompaniesUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipFourMember |  |
Number of issuers in default | 4 nwin_NumberOfIssuersInDefaultUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipFourMember |  |
Number of issuers in deferral | 5 nwin_NumberOfIssuersInDeferralUnderCollateralizedDebtObligations / nwin_CusipAxis = nwin_CusipFourMember |  |
Defaults & deferrals as a % of performing collateral | 20.48%nwin_PercentageOfDefaultsAndDeferralsOnPerformingCollateral / nwin_CusipAxis = nwin_CusipFourMember |  |
Subordination: |  |  |
As a % of performing collateral | 23.62%nwin_PercentageOfSubordinationOnPerformingCollateral / nwin_CusipAxis = nwin_CusipFourMember |  |
As a % of performing collateral - adjusted for projected future defaults | 19.26%nwin_PercentageOfSubordinationOnPerformingCollateralAdjustedForProjectedFutureDefaults / nwin_CusipAxis = nwin_CusipFourMember |  |
Other-than-temporary impairment model assumptions: |  |  |
Year 1 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear1IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipFourMember |  |
Year 2 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear2IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipFourMember |  |
Year 3 - issuer average | 1.80%nwin_PercentageOfDefaultsRatesOnYear3IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipFourMember |  |
> 3 Years - issuer average |  | [1] |
Discount rate - 3 month Libor, plus implicit yield spread at purchase | 1.44%nwin_PercentageOfDiscountRateOn3MonthLiborPlusImplicitYieldSpread / nwin_CusipAxis = nwin_CusipFourMember |  |
Recovery assumptions |  | [2] |
Prepayments | 0.00%nwin_PercentageOfPrepaymentsOnOtherThanTemporaryImpairmentModelAssumptions / nwin_CusipAxis = nwin_CusipFourMember |  |
Other-than-temporary impairment | $ 62 us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld / nwin_CusipAxis = nwin_CusipFourMember |  |
[1] | Default rates > 3 years are evaluated on a issuer by issuer basis and range from 0.25% to 5.00%.
[2] | Recovery assumptions are evaluated on a issuer by issuer basis and range from 0% to 15% with a five year lag.

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