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Fair Value Measurements and Disclosure (Details 4) (USD $) In Thousands, unless otherwise specified											12 Months Ended
	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2014 Significant Unobservable Inputs Level 3 [Member]		Dec. 31, 2013 Significant Unobservable Inputs Level 3 [Member]		Dec. 31, 2013 Sales Comparison Approach Valuation Technique [Member] Real Estate Mortgage [Member] Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs Level 3 [Member]	Sep. 30, 2014 Sales Comparison Approach Valuation Technique [Member] Commercial Real Estate [Member] Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs Level 3 [Member]	Dec. 31, 2013 Discounted Cash Flow Valuation Technique [Member] Real Estate Construction [Member] Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs Level 3 [Member]	Dec. 31, 2013 Minimum [Member] Discounted Cash Flow Valuation Technique [Member] Real Estate Construction [Member] Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs Level 3 [Member]	Dec. 31, 2013 Maximum [Member] Discounted Cash Flow Valuation Technique [Member] Real Estate Construction [Member] Fair Value, Measurements, Nonrecurring [Member] Significant Unobservable Inputs Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 333	[1]	$ 3,889	[1]	$ 333	[1]	$ 3,889	[1]		$ 333	$ 3,889
Impaired loans	$ 0	[1]	$ 1,388	[1]	$ 0	[1]	$ 1,388	[1]	$ 1,388
Discount rate											8.49%	1.00%	10.00%
[1] Nonrecurring

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

- Details

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

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherAssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant