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Deposits - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Time deposits, $250,000 and over	$ 20,103	$ 21,353

X

- Definition

Time Deposits 250,000 Or More

+ References

No definition available.

+ Details

Name:	unty_TimeDeposits250000OrMore
Namespace Prefix:	unty_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration