XML 75 R64.htm IDEA: XBRL DOCUMENT v3.21.2

Fair Value Measurements and Disclosure - Valuation Technique, Unobservable Input, and Qualitative Information (Details) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020 USD ($)
Discounted cash flow | Market credit risk adjusted spreads | Weighted Average | Junior Subordinated Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average inputs (percent)	0.0384	0.0357
Nonrecurring | Real estate construction and development
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 3,364
Nonrecurring | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 5,004
Significant Unobservable Inputs (Level 3) | Fair Value of Collateral Method for Collateral Dependent Loans | Real estate construction and development
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Adjustment Percentage		0.0702
Significant Unobservable Inputs (Level 3) | Fair Value of Collateral Method for Collateral Dependent Loans | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Adjustment Percentage		0.1369
Significant Unobservable Inputs (Level 3) | Nonrecurring | Real estate construction and development
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 3,364
Significant Unobservable Inputs (Level 3) | Nonrecurring | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value		$ 5,004

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents impaired real estate mortgage loans receivable as presented on the statement of financial position.

+ References

No definition available.

+ Details

Name:	ubfo_LoansReceivablesRealEstateMortgageFairValueDisclosure
Namespace Prefix:	ubfo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

No definition available.

+ Details

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

X

- Definition

Value of input used to measure loan, held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_LoansHeldForSaleMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of input used to measure long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_LongTermDebtMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_ValuationTechniqueDiscountedCashFlowMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputCreditSpreadMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_JuniorSubordinatedDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=ubfo_OtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=ubfo_FairValueofCollateralMethodforCollateralDependentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: