Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS (Narrative) (Details)

v3.6.0.2
ACQUISITIONS (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2016
Jan. 01, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]          
Acquisition related cost excluded from supplemental pro forma earnings     $ 0 $ 0 $ 20,345
Cash paid in acquisition     4,077 0 0
Issuance of common stock in regard to acquisition     453 0 549,523
Goodwill     298,191 $ 293,522  
StellarOne Bank          
Business Acquisition [Line Items]          
Number of shares equivalent to each share of acquired entity   0.9739      
Number of common shares issued   22,147,874      
Value of Company common stock issued   $ 549,500      
Acquisition related cost excluded from supplemental pro forma earnings         $ 20,345
Goodwill   $ 234,100      
ODCM          
Business Acquisition [Line Items]          
Assets under management $ 300,000        
Fair value of total consideration transferred 9,100        
Cash paid in acquisition 4,100        
Issuance of common stock in regard to acquisition 453   $ 453    
Goodwill 4,700        
Business combination, finite-lived intangibles $ 4,500        
Minimum | ODCM          
Business Acquisition [Line Items]          
Intangible assets, amortization period     5 years    
Maximum | ODCM          
Business Acquisition [Line Items]          
Intangible assets, amortization period     10 years