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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

X

- 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

X

- 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