Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Schedule of Business Acquisition and the Amounts of Acquired Identifiable Assets and Liabilities) (Details)

v2.4.1.9
ACQUISITIONS (Schedule of Business Acquisition and the Amounts of Acquired Identifiable Assets and Liabilities) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended
Jan. 01, 2014
Dec. 31, 2014
Dec. 31, 2013
Fair value of liabilities assumed:      
Goodwill   $ 293,522us-gaap_Goodwill $ 59,400us-gaap_Goodwill
StellarOne Bank [Member]      
Fair value of assets acquired:      
Cash and cash equivalents 49,989us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Securities available for sale 460,892us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Loans held for sale 11,377ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Loans 2,238,981ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoans
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Bank premise and equipment 67,164us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
OREO 4,319ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherRealEstateOwnedAndRepossessedAssets
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Core deposit intangible 29,570ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCoreDepositIntangible
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Other assets 95,229us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Total assets 2,957,521us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Fair value of liabilities assumed:      
Deposits 2,479,874ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Short-term borrowings 49,227us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Long-term borrowings 98,697us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Other Liabilities 14,322ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Total liabilities 2,642,120us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Net identifiable assets acquired 315,401us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Goodwill 234,122us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		[1]    
Net assets acquired 549,523us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Company's common shares issued 22,147,874us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Purchase price per share of the Company's common stock $ 24.81us-gaap_SharesIssuedPricePerShare
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		[2]    
Value of Company common stock issued 549,489us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Value of stock options outstanding 34ubsh_BusinessCombinationTransferredStockOptionsOutstandingValue
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
Fair value of total consideration transferred $ 549,523us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		   
[1] No goodwill is expected to be deductible for federal income tax purposes. The goodwill will be primarily allocated to the community bank segment.
[2] The value of the shares of common stock exchanged with StellarOne shareholders was based upon the closing price of the Company's common stock at December 31, 2013, the last trading day prior to the date of acquisition.