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Commitments and Contingencies (Details Textual) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Standby Letters Of Credit [Member] |  |
Letters of Credit Outstanding, Amount | $ 9,251,000 | $ 8,696,000
Minimum [Member] |  |
Loans Receivable, Fixed Rates of Interest | 2.30% | 2.30%
Maximum [Member] |  |
Loans Receivable, Fixed Rates of Interest | 10.00% | 10.00%

X
- Definition The percentage of fixed rates of interest related to loan receivables. + References No definition available. + Details
Name: | nwin_LoansReceivableFixedRatesOfInterest
Namespace Prefix: | nwin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant