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Securities (Details 1) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2014
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Dec. 31, 2013
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| Contractual Maturities Of Available For Sale Debt Securities [Line Items] | ||
| Estimated Fair Value, Due in one year or less | $ 8,884us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue | |
| Estimated Fair Value, Due from one to five years | 17,956us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue | |
| Estimated Fair Value, Due from five to ten years | 22,135us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue | |
| Estimated Fair Value, Due over ten years | 53,504us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue | |
| Estimated Fair Value, Total | 220,053us-gaap_AvailableForSaleSecurities | 195,632us-gaap_AvailableForSaleSecurities |
| Tax-Equivalent Yield, Due in one year or less | 6.43%nwin_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Due from one to five years | 2.56%nwin_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Due from five to ten years | 6.11%nwin_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Due over ten years | 4.65%nwin_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Total | 3.62%nwin_AvailableForSaleSecuritiesTaxEquivalentYieldRate | |
| Collateralized Mortgage Backed Securities [Member] | ||
| Contractual Maturities Of Available For Sale Debt Securities [Line Items] | ||
| Estimated Fair Value, Total |
$ 117,574us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
$ 100,315us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
| Tax-Equivalent Yield, Total |
2.64%nwin_AvailableForSaleSecuritiesTaxEquivalentYieldRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
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- Definition
This item represents the tax equivalents yield of available-for-sale debt securities which are expected to mature after five years and through ten years from the balance sheet date. No definition available.
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- Definition
This item represents the tax equivalents yield of available-for-sale debt securities which are expected to mature after one year and through five years from the balance sheet date. No definition available.
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- Definition
This item represents the tax equivalents yield of available-for-sale debt securities which are expected to mature after ten years from the balance sheet date. No definition available.
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- Definition
This item represents the tax equivalents yield of available-for-sale debt securities which are expected to mature within one year from the balance sheet date. No definition available.
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- Definition
This item represents the tax equivalents yield, represented as a percentage of available-for-sale debt securities. No definition available.
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- Details
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- Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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