Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS (Narrative) (Details)

v2.4.1.9
ACQUISITIONS (Narrative) (Details) (StellarOne Bank [Member], USD $)
0 Months Ended
Jan. 01, 2014
Jan. 01, 2014
StellarOne Bank [Member]
   
Business Acquisition [Line Items]    
Number of shares equivalent to each share of acquired entity 0.9739ubsh_BusinessAcquisitionNumberOfSharesEquivalentToEachShareOfAcquiredEntity
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
0.9739ubsh_BusinessAcquisitionNumberOfSharesEquivalentToEachShareOfAcquiredEntity
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Number of common shares issued 22,147,874us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
 
Value of Company common stock issued $ 549,500,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
 
Assets acquired 2,960,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
2,960,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Liabilties assumed $ 2,640,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
$ 2,640,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember