XML 83 R66.htm IDEA: XBRL DOCUMENT
v3.25.1

Loans- Narrative (Details) | 12 Months Ended
--- | ---
Dec. 31, 2024 USD ($) rating | Dec. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Remaining undisbursed commitments, loan funds | $ 0 | $ 0
Number of risk rating approaches | rating | 2 |
Minimum | Grade 4 and 5 Pass |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Notes receivable, period of loss recognition | 3 years |
Maximum | Grade 4 and 5 Pass |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Notes receivable, period of loss recognition | 4 years |
Commitments to extend credit |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Contractual amount | $ 204,033,000 | 183,537,000
Standby letters of credit |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Contractual amount | $ 29,174,000 | $ 2,940,000

X
- Definition Financing Receivable, Remaining Undisbursed Commitments, Loan Funds + References No definition available. + Details
Name: | ubfo_FinancingReceivableRemainingUndisbursedCommitmentsLoanFunds
Namespace Prefix: | ubfo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Period for recognition of loss in the event of default in the payment of notes receivable. + References No definition available. + Details
Name: | ubfo_NotesReceivablePeriodOfLossRecognition
Namespace Prefix: | ubfo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of risk rating approaches evaluated to assign risk ratings to loan receivable. + References No definition available. + Details
Name: | ubfo_NumberOfRiskRatingApproaches
Namespace Prefix: | ubfo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of commitment subject to concentration of credit or market risk or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_FairValueConcentrationOfRiskCommitments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=ubfo_Grade4And5PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |