XML 91 R77.htm IDEA: XBRL DOCUMENT v3.10.0.1

Common Stock Repurchase Plan (Details)	Apr. 25, 2017 USD ($)
Common Stock Repurchase Plan [Abstract]
Repurchase plan, authorized amount	$ 3,000,000

X

- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

Name:	ubfo_CommonStockRepurchasePlanAbstract
Namespace Prefix:	ubfo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant