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Shareholders' Equity - Summary of Actual Capital Amount and Well Capitalized Total Risk-Based, Tier I Risk-Based, and Tier I Leverage Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2013
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Dec. 31, 2012
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Total Capital (to Risk Weighted Assets), Adequacy purposes, Ratio |
10.00% |
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| Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Ratio |
19.20% |
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| Tier I Leverage (to Average Assets), Actual, Ratio |
10.88% |
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| Tier I Leverage (to Average Assets), Adequacy Purposes, Ratio |
5.00% |
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United Security Bancshares, Inc. [Member]
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Total Capital (to Risk Weighted Assets), Actual, Amount |
$ 64,842 |
$ 63,957 |
| Total Capital (to Risk Weighted Assets), Actual, Ratio |
19.20% |
17.05% |
| Total Capital (to Risk Weighted Assets), Adequacy purposes, Amount |
27,012 |
30,008 |
| Total Capital (to Risk Weighted Assets), Adequacy purposes, Ratio |
8.00% |
8.00% |
| Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Amount |
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| Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Ratio |
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| Tier I Capital (to Risk Weighted Assets), Actual, Amount |
60,557 |
59,088 |
| Tier I Capital (to Risk Weighted Assets), Actual, Ratio |
17.93% |
15.75% |
| Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Amount |
13,506 |
15,004 |
| Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Ratio |
4.00% |
4.00% |
| Tier I Capital (to Risk Weighted Assets), To BE Well Capitalized Under Prompt Corrective Action Provisions, Amount |
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| Tier I Capital (to Risk Weighted Assets), To BE Well Capitalized Under Prompt Corrective Action Provisions, Ratio |
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| Tier I Leverage (to Average Assets), Actual, Amount |
60,557 |
59,088 |
| Tier I Leverage (to Average Assets), Actual, Ratio |
10.88% |
10.51% |
| Tier I Leverage (to Average Assets), Adequacy Purposes, Amount |
16,698 |
16,873 |
| Tier I Leverage (to Average Assets), Adequacy Purposes, Ratio |
3.00% |
3.00% |
| Tier I Leverage (to Average Assets), To Be Capitalized Under Prompt Corrective Action Provisions, Amount |
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| Tier I Leverage (to Average Assets), To Be Capitalized Under Prompt Corrective Action Provisions, Ratio |
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FUSB [Member]
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Total Capital (to Risk Weighted Assets), Actual, Amount |
65,304 |
64,422 |
| Total Capital (to Risk Weighted Assets), Actual, Ratio |
19.34% |
17.17% |
| Total Capital (to Risk Weighted Assets), Adequacy purposes, Amount |
27,012 |
30,008 |
| Total Capital (to Risk Weighted Assets), Adequacy purposes, Ratio |
8.00% |
8.00% |
| Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Amount |
33,765 |
37,510 |
| Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Ratio |
10.00% |
10.00% |
| Tier I Capital (to Risk Weighted Assets), Actual, Amount |
61,019 |
59,553 |
| Tier I Capital (to Risk Weighted Assets), Actual, Ratio |
18.07% |
15.88% |
| Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Amount |
13,506 |
15,004 |
| Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Ratio |
4.00% |
4.00% |
| Tier I Capital (to Risk Weighted Assets), To BE Well Capitalized Under Prompt Corrective Action Provisions, Amount |
20,259 |
22,506 |
| Tier I Capital (to Risk Weighted Assets), To BE Well Capitalized Under Prompt Corrective Action Provisions, Ratio |
6.00% |
6.00% |
| Tier I Leverage (to Average Assets), Actual, Amount |
61,019 |
59,553 |
| Tier I Leverage (to Average Assets), Actual, Ratio |
10.97% |
10.60% |
| Tier I Leverage (to Average Assets), Adequacy Purposes, Amount |
16,691 |
16,862 |
| Tier I Leverage (to Average Assets), Adequacy Purposes, Ratio |
3.00% |
3.00% |
| Tier I Leverage (to Average Assets), To Be Capitalized Under Prompt Corrective Action Provisions, Amount |
$ 27,819 |
$ 28,104 |
| Tier I Leverage (to Average Assets), To Be Capitalized Under Prompt Corrective Action Provisions, Ratio |
5.00% |
5.00% |