Annual report pursuant to Section 13 and 15(d)

INTANGIBLE ASSETS (Narrative) (Details)

v2.4.1.9
INTANGIBLE ASSETS (Narrative) (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2014
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization expense   $ 9,795,000us-gaap_AmortizationOfIntangibleAssets $ 3,831,000us-gaap_AmortizationOfIntangibleAssets $ 5,336,000us-gaap_AmortizationOfIntangibleAssets  
Impairment charges 0us-gaap_GoodwillAndIntangibleAssetImpairment        
Goodwill   293,522,000us-gaap_Goodwill 59,400,000us-gaap_Goodwill    
Core Deposits [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization expense   9,800,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember 		3,800,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember 		4,900,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CoreDepositsMember 		 
Core Deposits [Member] | Minimum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period   4 years      
Core Deposits [Member] | Maximum [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period   14 years      
Trademarks [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization expense   0us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember 		33,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember 		400,000us-gaap_AmortizationOfIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember 		 
StellarOne Bank [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period         8 years
Acquired intangible assets         29,570,000ubsh_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCoreDepositIntangible
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember
Goodwill         $ 234,122,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= ubsh_StellaroneBankMember 		[1]
[1] No goodwill is expected to be deductible for federal income tax purposes. The goodwill will be primarily allocated to the community bank segment.