Description Of Business	12 Months Ended
Dec. 31, 2011
Description Of Business [Abstract]
Description Of Business	1. DESCRIPTION OF BUSINESS United Security Bancshares, Inc. ("Bancshares," "USBI" or the "Company") and its wholly-owned subsidiary, First United Security Bank (the "Bank" or "FUSB"), provide commercial banking services to customers through nineteen banking offices located in Brent, Bucksville, Butler, Calera, Centreville, Coffeeville, Columbiana, Fulton, Gilbertown, Grove Hill, Harpersville, Jackson, Thomasville, Tuscaloosa and Woodstock, Alabama. The Bank owns all of the stock of Acceptance Loan Company, Inc. ("ALC"), an Alabama corporation. ALC is a finance company organized for the purpose of making consumer loans and purchasing consumer loans from vendors. ALC has offices located within the communities served by the Bank, as well as offices outside the Bank's market area in Alabama and Southeast Mississippi. The Bank also owns all of the stock of FUSB Reinsurance, Inc. ("FUSB Reinsurance"), an Arizona corporation. FUSB Reinsurance is an insurance company that was created to underwrite credit life and accidental death insurance related to loans written by the Bank and ALC. The Bank also invests in limited partnerships that operate qualified affordable housing projects to receive tax benefits. Restated Financial Data Subsequent to the filing of the Company's annual report on Form 10-K for the year ended December 31, 2010, management of the Company identified an error resulting in the understatement of the Company's allowance for loan losses related to valuation assessments of impaired loans. As a result, the Company restated certain amounts in the accompanying 2010 consolidated financial statements to correct errors in previously reported amounts as described in Note 3. The restatement affected certain previously disclosed notes to the 2010 consolidated statements. See Note 2, "Summary of Significant Accounting Policies," Note 3, "Restatement of 2010 Financial Statements," Note 5, "Loans and Allowance for Loan Losses," Note 12, "Income Taxes," Note 15, "Shareholders' Equity," Note 16, "Segment Reporting," Note 20, "Fair Value of Measurements," Note 21, "United Security Bancshares, Inc. (Parent Company Only) Financial Information," and Note 22, "Quarterly Data (Unaudited)."

1. DESCRIPTION OF BUSINESS

United Security Bancshares, Inc. ("Bancshares," "USBI" or the "Company") and its wholly-owned subsidiary, First United Security Bank (the "Bank" or "FUSB"), provide commercial banking services to customers through nineteen banking offices located in Brent, Bucksville, Butler, Calera, Centreville, Coffeeville, Columbiana, Fulton, Gilbertown, Grove Hill, Harpersville, Jackson, Thomasville, Tuscaloosa and Woodstock, Alabama.

The Bank owns all of the stock of Acceptance Loan Company, Inc. ("ALC"), an Alabama corporation. ALC is a finance company organized for the purpose of making consumer loans and purchasing consumer loans from vendors. ALC has offices located within the communities served by the Bank, as well as offices outside the Bank's market area in Alabama and Southeast Mississippi. The Bank also owns all of the stock of FUSB Reinsurance, Inc. ("FUSB Reinsurance"), an Arizona corporation. FUSB Reinsurance is an insurance company that was created to underwrite credit life and accidental death insurance related to loans written by the Bank and ALC. The Bank also invests in limited partnerships that operate qualified affordable housing projects to receive tax benefits.

Restated Financial Data

Subsequent to the filing of the Company's annual report on Form 10-K for the year ended December 31, 2010, management of the Company identified an error resulting in the understatement of the Company's allowance for loan losses related to valuation assessments of impaired loans. As a result, the Company restated certain amounts in the accompanying 2010 consolidated financial statements to correct errors in previously reported amounts as described in Note 3. The restatement affected certain previously disclosed notes to the 2010 consolidated statements. See Note 2, "Summary of Significant Accounting Policies," Note 3, "Restatement of 2010 Financial Statements," Note 5, "Loans and Allowance for Loan Losses," Note 12, "Income Taxes," Note 15, "Shareholders' Equity," Note 16, "Segment Reporting," Note 20, "Fair Value of Measurements," Note 21, "United Security Bancshares, Inc. (Parent Company Only) Financial Information," and Note 22, "Quarterly Data (Unaudited)."