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Deposits - Narrative (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023
Deposits [Abstract]
Deposit overdrafts	$ 178,000,000	$ 387,000
Deposits of related parties	11,500,000	10,300,000
Interest-bearing deposit, brokered	$ 100,300,000	$ 0

X

- Definition

Deposit balances representing overdrafts reclassified as loan balances.

+ References

No definition available.

+ Details

Name:	ubfo_DepositOverdrafts
Namespace Prefix:	ubfo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Interest-Bearing Deposit, Brokered

+ References

No definition available.

+ Details

Name:	ubfo_InterestBearingDepositBrokered
Namespace Prefix:	ubfo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

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