|
Securities (Details 1) (USD $)
In Thousands, unless otherwise specified |
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Contractual Maturities Of Available For Sale Debt Securities [Line Items] | ||
| Estimated Fair Value, Due in one year or less | $ 6,962us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue | |
| Estimated Fair Value, Due from one to five years | 25,123us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue | |
| Estimated Fair Value, Due from five to ten years | 21,644us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue | |
| Estimated Fair Value, Due over ten years | 63,821us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue | |
| Estimated Fair Value, Total | 230,842us-gaap_AvailableForSaleSecurities | 220,053us-gaap_AvailableForSaleSecurities |
| Tax-Equivalent Yield, Due in one year or less | 8.02%nwin_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Due from one to five years | 2.24%nwin_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Due from five to ten years | 6.10%nwin_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Due over ten years | 4.56%nwin_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsTaxEquivalentYieldRate | |
| Tax-Equivalent Yield, Total | 3.58%nwin_AvailableForSaleSecuritiesTaxEquivalentYieldRate | |
| Collateralized Mortgage Backed Securities [Member] | ||
| Contractual Maturities Of Available For Sale Debt Securities [Line Items] | ||
| Estimated Fair Value, Total |
$ 113,292us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
$ 117,574us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
| Tax-Equivalent Yield, Total |
2.57%nwin_AvailableForSaleSecuritiesTaxEquivalentYieldRate / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesMember |
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- 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.
|
| X | ||||||||||
|
- Definition
This item represents the tax equivalents yield, represented as a percentage of available-for-sale debt securities. No definition available.
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- 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
|
| X | ||||||||||
|
- Details
|