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Loans Receivable (Details Textual) (USD $) | 3 Months Ended
--- | ---
Jun. 30, 2012
Proceeds from Sale of Portfolio Fixed Rate Mortgage Loan | $ 3,400,000
Prepayment Risk [Member] |
Gain (Loss) from Price Risk Management Activity | $ 183,000

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- Definition The cash inflow from sales of loans that are secured with real estate mortgages. + References No definition available. + Details
Name: | nwin_ProceedsFromSaleOfPortfolioFixedRateMortgageLoan
Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Gain (loss) incurred in risk management activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
Name: | us-gaap_GainLossFromPriceRiskManagementActivity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration