Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS (Narrative) (Details)

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ACQUISITIONS (Narrative) (Details) (USD $)
 3 Months Ended 3 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Jan. 02, 2014
Acquisition Date, January 1, 2014 [Member]
site
Mar. 31, 2014
StellarOne Bank [Member]
Mar. 31, 2013
StellarOne Bank [Member]
Jan. 02, 2014
StellarOne Bank [Member]
Acquisition Date, January 1, 2014 [Member]
Jan. 02, 2014
StellarOne Bank [Member]
Performing Financing Receivable [Member]
Acquisition Date, January 1, 2014 [Member]
Business Acquisition [Line Items]                  
Number of shares equivalent to each share of acquired entity               0.9739  
Number of common shares issued               22,147,874  
Fair value of common shares issued               $ 549,500,000  
Acquired performing loans, Fair value                 2,100,000,000
Value of Company common stock issued               549,489,000  
Acquired performing loans, principal and interest payments receivable                 2,500,000,000
Number of overlapping bank branches         13        
Acquired performing loans not expected to be collected               35,400,000  
Fair value of loans acquired with a deterioration of credit quality 138,431,000 3,622,000 4,019,000     145,454,000      
Carry-over for allowance for credit losses 30,907,000 30,135,000 34,415,000 34,916,000          
Merger-related costs $ 13,168,000         $ 13,168,000