Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Feb. 01, 2019
Aug. 23, 2012
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2016
Subordinated Borrowing [Line Items]              
Remaining available balance for the federal funds lines     $ 602,000   $ 382,000    
Remaining available balance of alternate line of credit     25,000   25,000    
Maximum collateral dependent line of credit with the FHLB     4,100,000   4,000,000    
Subordinated debt     158,500       $ 150,000
Prepayment penalty   $ 19,600          
Prepayment penalty amortization expense     493 $ 481      
Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance     150,500        
Remaining fair value discount on acquired notes     15,500        
Subordinated Debt              
Subordinated Borrowing [Line Items]              
Remaining fair value discount on acquired notes     $ 1,500   $ 1,600    
Fixed interest rate on debt instrument             5.00%
Subordinated Debt | LIBOR              
Subordinated Borrowing [Line Items]              
Spread on LIBOR     3.175%        
Acquisitions, Prior To 2006              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance     $ 58,500        
Stellarone and Xenith | Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance     87,000        
Access National Bank              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance $ 5,000            
Access National Bank | Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Remaining fair value discount on acquired notes $ 25            
Xenith              
Subordinated Borrowing [Line Items]              
Subordinated debt           $ 8,500  
Xenith | Subordinated Debt              
Subordinated Borrowing [Line Items]              
Remaining fair value discount on acquired notes     $ 129     $ 259  
Fixed interest rate on debt instrument           6.75%