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United Security Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Statements of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Income:                    
Net income $ 720us-gaap_ProfitLoss $ 837us-gaap_ProfitLoss $ 1,218us-gaap_ProfitLoss $ 774us-gaap_ProfitLoss $ 955us-gaap_ProfitLoss $ 904us-gaap_ProfitLoss $ 1,182us-gaap_ProfitLoss $ 886us-gaap_ProfitLoss $ 3,549us-gaap_ProfitLoss $ 3,927us-gaap_ProfitLoss
United Security Bancshares, Inc. [Member]                    
Income:                    
Dividend income, First US Bank                 381us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
200us-gaap_DividendIncomeOperating
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other income                   6us-gaap_OtherIncome
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Total income                 381us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
206us-gaap_Revenues
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Expense:                 372us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
334us-gaap_OperatingExpenses
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Gain (loss) before equity in undistributed income of subsidiaries                 9usbi_IncomeLossBeforeEquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
(128)usbi_IncomeLossBeforeEquityInUndistributedIncomeOfSubsidiaries
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Equity in undistributed income of subsidiaries                 3,540usbi_EquityInUndistributedEarningsOfSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
4,055usbi_EquityInUndistributedEarningsOfSubsidiary
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Net income                 $ 3,549us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
$ 3,927us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember