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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	Dec. 31, 2014	Dec. 31, 2013
United Security Bancshares, Inc. [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	$ 69,251us-gaap_Capital / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	$ 64,842us-gaap_Capital / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Total Capital (to Risk Weighted Assets), Actual, Ratio	22.61%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	19.20%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Total Capital (to Risk Weighted Assets), Adequacy purposes, Amount	24,503us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	27,012us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Total Capital (to Risk Weighted Assets), Adequacy purposes, Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Amount
Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Ratio
Tier I Capital (to Risk Weighted Assets), Actual, Amount	65,394us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	60,557us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Capital (to Risk Weighted Assets), Actual, Ratio	21.35%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	17.93%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Amount	12,252us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	13,506us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Leverage (to Average Assets), Actual, Amount	65,394us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	60,557us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Leverage (to Average Assets), Actual, Ratio	11.75%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	10.88%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Leverage (to Average Assets), Adequacy Purposes, Amount	16,690us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	16,698us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
Tier I Leverage (to Average Assets), Adequacy Purposes, Ratio	3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember	3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = usbi_UnitedSecurityBancsharesIncMember
FUSB [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to Risk Weighted Assets), Actual, Amount	69,765us-gaap_Capital / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	65,304us-gaap_Capital / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Total Capital (to Risk Weighted Assets), Actual, Ratio	22.78%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	19.34%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Total Capital (to Risk Weighted Assets), Adequacy purposes, Amount	24,503us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	27,012us-gaap_CapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Total Capital (to Risk Weighted Assets), Adequacy purposes, Ratio	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Amount	30,629us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	33,765us-gaap_CapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Total Capital (to Risk Weighted Assets), To be well Capitalized Under Prompt Corrective Action Provisions , Ratio	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Capital (to Risk Weighted Assets), Actual, Amount	65,908us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	61,019us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Capital (to Risk Weighted Assets), Actual, Ratio	21.52%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	18.07%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Amount	12,252us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	13,506us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Capital (to Risk Weighted Assets), Adequacy Purposes, Ratio	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Capital (to Risk Weighted Assets), To BE Well Capitalized Under Prompt Corrective Action Provisions, Amount	18,377us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	20,259us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Capital (to Risk Weighted Assets), To BE Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Leverage (to Average Assets), Actual, Amount	65,908us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	61,019us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Leverage (to Average Assets), Actual, Ratio	11.85%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	10.97%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Leverage (to Average Assets), Adequacy Purposes, Amount	16,684us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	16,691us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Leverage (to Average Assets), Adequacy Purposes, Ratio	3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	3.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Leverage (to Average Assets), To Be Capitalized Under Prompt Corrective Action Provisions, Amount	$ 27,807us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	$ 27,819us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember
Tier I Leverage (to Average Assets), To Be Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember	5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = usbi_FirstUnitedSecurityBankMember

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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826

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X

- Definition

Tier 1 capital divided by risk weighted assets as defined by regulations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826



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-Section 50

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