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United Security Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash on deposit	$ 34,166us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 47,720us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 54,126us-gaap_CashAndCashEquivalentsAtCarryingValue
Investment in subsidiaries	5us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	5us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Total Assets	572,609us-gaap_Assets	569,801us-gaap_Assets
Liabilities:
Other liabilities	8,131us-gaap_OtherLiabilities	8,930us-gaap_OtherLiabilities
Total liabilities and shareholders' equity	572,609us-gaap_LiabilitiesAndStockholdersEquity	569,801us-gaap_LiabilitiesAndStockholdersEquity
United Security Bancshares, Inc. [Member]
Assets:
Cash on deposit	64us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	73us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	83us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Investment in subsidiaries	75,676us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	70,557us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total Assets	75,740us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	70,630us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Liabilities:
Other liabilities	578us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	535us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Shareholders' equity	75,162us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	70,095us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total liabilities and shareholders' equity	$ 75,740us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 70,630us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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