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Deposits (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
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