Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
 12 Months Ended
Jan. 01, 2018
Jan. 01, 2014
Aug. 23, 2012
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Subordinated Borrowing [Line Items]            
Remaining available balance for the federal funds lines       $ 382,000,000 $ 227,000,000  
Remaining borrowing capacity with correspondent banks       25,000,000 25,000,000  
Maximum collateral dependent line of credit with the FHLB       4,000,000,000 2,700,000,000  
Subordinated debt       158,500,000 150,000,000  
Prepayment penalty     $ 19,600,000      
Prepayment penalty amortization expense       2,000,000 1,900,000 $ 1,900,000
Trust Preferred Capital Notes            
Subordinated Borrowing [Line Items]            
Trust preferred capital notes principal balance       145,500,000    
Remaining fair value discount on acquired notes       15,700,000    
Subordinated Debt Notes            
Subordinated Borrowing [Line Items]            
Remaining fair value discount on acquired notes       $ 1,600,000 $ 1,800,000  
Stated percentage on debt instrument         5.00%  
Subordinated debt maturity date       Dec. 15, 2026    
LIBOR | Subordinated Debt Notes            
Subordinated Borrowing [Line Items]            
Three-month LIBOR rate plus       3.175%    
Acquisitions, Prior To 2006            
Subordinated Borrowing [Line Items]            
Trust preferred capital notes principal balance       $ 58,500,000    
StellarOne Bank | Trust Preferred Capital Notes            
Subordinated Borrowing [Line Items]            
Trust preferred capital notes principal balance   $ 32,000,000        
Xenith            
Subordinated Borrowing [Line Items]            
Trust preferred capital notes principal balance $ 55,000,000          
Subordinated debt 8,500,000          
Xenith | Trust Preferred Capital Notes            
Subordinated Borrowing [Line Items]            
Remaining fair value discount on acquired notes 9,900,000          
Xenith | Subordinated Debt Notes            
Subordinated Borrowing [Line Items]            
Remaining fair value discount on acquired notes $ 259,000     $ 154,000    
Stated percentage on debt instrument 6.75%