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Note 17 - Fair Value of Financial Instruments - Balances of Impaired Loans and OREO Measured at Fair Value on Nonrecurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets measured at fair value |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets measured at fair value |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets measured at fair value | 2,198 | 2,350
Impaired Loans [Member] |  |
Financial assets measured at fair value | 2,198 | 2,350
OREO [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Financial assets measured at fair value |  |
OREO [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Financial assets measured at fair value |  |
OREO [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Financial assets measured at fair value | 5,405 | 6,038
OREO [Member] |  |
Financial assets measured at fair value | $ 5,405 | $ 6,038

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=usbi_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=usbi_OreoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |