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Deposits (Details Textual) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Time Deposits 250000 Or More | $ 29.9 | $ 24.8

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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