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Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) contract	Dec. 31, 2023 USD ($)
Leases [Abstract]
Operating lease, number of contracts	14
Financing lease, number of contracts	0
Operating Lease, Cost | $	$ 762	$ 711

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- Definition

Lessee, Financing Lease, Number Of Contracts

+ References

No definition available.

+ Details

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X

- Definition

Lessee, Operating Lease, Number Of Contracts

+ References

No definition available.

+ Details

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Namespace Prefix:	ubfo_
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Balance Type:	na
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- References

No definition available.

+ Details

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X

- Definition

Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-4

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