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Foreclosed Real Estate (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Real Estate Properties [Line Items] |  |
Foreclosed real estate | $ 1,745 us-gaap_ForeclosedAssets | $ 1,084 us-gaap_ForeclosedAssets
Residential real estate, including home equity |  |
Real Estate Properties [Line Items] |  |
Foreclosed real estate | 324 us-gaap_ForeclosedAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember | 94 us-gaap_ForeclosedAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = nwin_ResidentialRealEstateIncludingHomeEquityMember
Commercial Real Estate [Member] |  |
Real Estate Properties [Line Items] |  |
Foreclosed real estate | 1,218 us-gaap_ForeclosedAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember | 990 us-gaap_ForeclosedAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialRealEstateMember
Commercial business |  |
Real Estate Properties [Line Items] |  |
Foreclosed real estate | $ 203 us-gaap_ForeclosedAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialLoanMember | $ 0 us-gaap_ForeclosedAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CommercialLoanMember

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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 + Details
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- Details
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