Annual report pursuant to Section 13 and 15(d)

INTANGIBLE ASSETS (Narrative) (Details)

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INTANGIBLE ASSETS (Narrative) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jan. 01, 2014
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization expense     $ 8,445,000 $ 9,795,000 $ 3,831,000
Impairment charges   $ 0      
Goodwill     $ 293,522,000 $ 293,522,000  
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         $ 33,000
StellarOne Bank [Member]          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, amortization period 8 years        
Acquired intangible assets $ 29,570,000        
Goodwill [1] $ 234,122,000        
[1] No goodwill is expected to be deductible for federal income tax purposes. The goodwill was primarily allocated to the community bank segment.