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United Security Bancshares, Inc. (Parent Company Only) Financial Information - Statements of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:                    
Net income $ 441 $ 544 $ 774 $ 836 $ 720 $ 837 $ 1,218 $ 774 $ 2,595 $ 3,549
Adjustments to reconcile net income to net cash provided by operating activities:                    
Net cash provided by operating activities                 7,400 8,563
Cash flows from financing activities:                    
Dividends paid                 (484) (181)
Net cash provided by financing activities                 2,033 (1,596)
Net increase (decrease) in cash and cash equivalents                 9,906 (13,554)
Cash and cash equivalents, beginning of period       34,166       47,720 34,166 47,720
Cash and cash equivalents, end of period 44,072       34,166       44,072 34,166
United Security Bancshares, Inc. [Member]                    
Cash flows from operating activities:                    
Net income                 2,595 3,549
Adjustments to reconcile net income to net cash provided by operating activities:                    
Distributions in excess of undistributed income (loss) of subsidiaries                 (1,849) (3,539)
Change in other assets and liabilities                 (176) 162
Net cash provided by operating activities                 570 172
Cash flows from financing activities:                    
Dividends paid                 (484) (181)
Net cash provided by financing activities                 (484) (181)
Net increase (decrease) in cash and cash equivalents                 86 (9)
Cash and cash equivalents, beginning of period       $ 64       $ 73 64 73
Cash and cash equivalents, end of period $ 150       $ 64       $ 150 $ 64