XML 98 R81.htm IDEA: XBRL DOCUMENT
v3.25.1

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