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Deposits (Details Textual) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Time Deposits 250000 Or More | $ 22.8 nwin_TimeDeposits250000OrMore | $ 19.8 nwin_TimeDeposits250000OrMore

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- Definition The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. + References No definition available. + Details
Name: | nwin_TimeDeposits250000OrMore
Namespace Prefix: | nwin_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant