XML 65 R83.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Fair Values of Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 Number | Dec. 31, 2013
Fair Value Pooled Trust Preferred Securities [Line Items] |  |  |
Book value | $ 217,671 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis |  | $ 200,461 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Fair value | 220,053 us-gaap_AvailableForSaleSecurities |  | 195,632 us-gaap_AvailableForSaleSecurities
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 |  |
Book value | 1,257 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / nwin_CusipAxis = nwin_CusipOneMember |  |
Fair value | 530 us-gaap_AvailableForSaleSecurities / nwin_CusipAxis = nwin_CusipOneMember |  |
Unrealized gains/(losses) | (727)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / nwin_CusipAxis = nwin_CusipOneMember |  |
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 |  |
Book value | 1,296 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / nwin_CusipAxis = nwin_CusipTwoMember |  |
Fair value | 539 us-gaap_AvailableForSaleSecurities / nwin_CusipAxis = nwin_CusipTwoMember |  |
Unrealized gains/(losses) | (757)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / nwin_CusipAxis = nwin_CusipTwoMember |  |
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 |  |
Book value | 1,303 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / nwin_CusipAxis = nwin_CusipThreeMember |  |
Fair value | 822 us-gaap_AvailableForSaleSecurities / nwin_CusipAxis = nwin_CusipThreeMember |  |
Unrealized gains/(losses) | (481)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / nwin_CusipAxis = nwin_CusipThreeMember |  |
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 |  |
Book value | 1,285 us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis / nwin_CusipAxis = nwin_CusipFourMember |  |
Fair value | 541 us-gaap_AvailableForSaleSecurities / nwin_CusipAxis = nwin_CusipFourMember |  |
Unrealized gains/(losses) | (744)us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / nwin_CusipAxis = nwin_CusipFourMember |  |
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.

X
- Definition The nine-character unique securities identifier assigned to the instrument. + References No definition available. + Details
Name: | nwin_CommitteeForUniformSecuritiesIdentificationProceduresCusip1
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | nwin_FairValuePooledTrustPreferredSecuritiesLineItems
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of issuers in default under collateralized debt obligation. + References No definition available. + Details
Name: | nwin_NumberOfIssuersInDefaultUnderCollateralizedDebtObligations
Namespace Prefix: | nwin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of issuers in deferral under collateralized debt obligation. + References No definition available. + Details
Name: | nwin_NumberOfIssuersInDeferralUnderCollateralizedDebtObligations
Namespace Prefix: | nwin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of performing banks under collateralized debt obligation. + References No definition available. + Details
Name: | nwin_NumberOfPerformingBanksUnderCollateralizedDebtObligations
Namespace Prefix: | nwin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of performing insurance companies under collateralized debt obligation. + References No definition available. + Details
Name: | nwin_NumberOfPerformingInsuranceCompaniesUnderCollateralizedDebtObligations
Namespace Prefix: | nwin_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | nwin_OtherThanTemporaryImpairmentModelAssumptionsAbstract
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of default and deferral on performing collateral. + References No definition available. + Details
Name: | nwin_PercentageOfDefaultsAndDeferralsOnPerformingCollateral
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of defaults rates on above 3 years issuer average in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfDefaultsRatesOnAbove3YearsIssuerAverageInOtherThanTemporaryImpairmentModelAssumptions
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of defaults rates on year 1 issuer average in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfDefaultsRatesOnYear1IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of defaults rates on year 2 issuer average in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfDefaultsRatesOnYear2IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of defaults rates on year 3 issuer average in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfDefaultsRatesOnYear3IssuerAverageInOtherThanTemporaryImpairmentModelAssumptions
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of discount rate on 3 month LIBOR plus implicit yield spread in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfDiscountRateOn3MonthLiborPlusImplicitYieldSpread
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of prepayments in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfPrepaymentsOnOtherThanTemporaryImpairmentModelAssumptions
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of recovery assumptions in other than temporary impairment model assumptions. + References No definition available. + Details
Name: | nwin_PercentageOfRecoveryAssumptionsOnOtherThanTemporaryImpairmentModelAssumptions
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subordination on performing collateral. + References No definition available. + Details
Name: | nwin_PercentageOfSubordinationOnPerformingCollateral
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subordination on performing collateral adjusted for projected future defaults. + References No definition available. + Details
Name: | nwin_PercentageOfSubordinationOnPerformingCollateralAdjustedForProjectedFutureDefaults
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | nwin_SubordinationAbstract
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Class of trust preferred securities. + References No definition available. + Details
Name: | nwin_TrustPreferredSecuritiesClass
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deal name of trust preferred securities. + References No definition available. + Details
Name: | nwin_TrustPreferredSecuritiesDealName
Namespace Prefix: | nwin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the cost of debt 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
Name: | us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
Name: | us-gaap_DebtInstrumentCreditRating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
Name: | us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | nwin_CusipAxis=nwin_CusipFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nwin_CusipAxis=nwin_CusipOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nwin_CusipAxis=nwin_CusipThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | nwin_CusipAxis=nwin_CusipTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |