Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Aug. 29, 2019
Feb. 01, 2019
Aug. 23, 2012
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2018
Subordinated Borrowing [Line Items]              
Remaining available balance for the federal funds lines         $ 682,000,000.0 $ 382,000,000.0  
Remaining borrowing capacity with correspondent banks         25,000,000.0 25,000,000.0  
Maximum collateral dependent line of credit with the FHLB         5,200,000,000 4,000,000,000.0  
Subordinated debt       $ 150,000,000.0 158,500,000 158,500,000  
Prepayment penalty     $ 19,600,000        
Unamortized prepayment penalty recognized as a component of noninterest expense $ 7,400,000            
Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance         150,500,000    
Remaining fair value discount on acquired notes         14,900,000    
Subordinated Debt              
Subordinated Borrowing [Line Items]              
Remaining fair value discount on acquired notes         $ 1,400,000 $ 1,600,000  
Stated percentage on debt instrument       5.00%      
Subordinated debt maturity date       Dec. 15, 2021 Dec. 15, 2026    
LIBOR | Subordinated Debt              
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 and Xenith [Member] | Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred securities acquired         87,000,000.0    
Xenith              
Subordinated Borrowing [Line Items]              
Subordinated debt             $ 8,500,000
Xenith | Subordinated Debt              
Subordinated Borrowing [Line Items]              
Remaining fair value discount on acquired notes         $ 51,000   $ 259,000
Stated percentage on debt instrument             6.75%
Access National Bank              
Subordinated Borrowing [Line Items]              
Trust preferred securities acquired   $ 5,000,000.0