Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 29, 2019
Feb. 01, 2019
Aug. 23, 2012
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 30, 2020
Subordinated Borrowing [Line Items]              
Remaining available balance for the federal funds lines       $ 997,000 $ 847,000    
Maximum collateral dependent line of credit with the FHLB       6,000,000      
Proceeds from issuance of long-term borrowings       246,869 0 $ 550,000  
Subordinated Debt       250,000 150,000    
Prepayment of long-term FHLB advances       200,000 550,000    
FHLB advances, prepayment penalty $ 7,400   $ 19,600 14,700 31,200    
Long-term debt, early repayments       364,695 619,616 $ 220,614  
Subordinated debt redeemed             $ 8,500
Remaining borrowing capacity       $ 25,000 25,000    
Subordinated Debt              
Subordinated Borrowing [Line Items]              
Three-month LIBOR rate plus       1.86%      
2026 Subordinate Debt              
Subordinated Borrowing [Line Items]              
Subordinated Debt         $ 150,000    
Stated percentage on debt instrument         5.00%    
Maturity date         Dec. 15, 2026    
2031 Subordinate Debt              
Subordinated Borrowing [Line Items]              
Proceeds from issuance of long-term borrowings       $ 246,900      
Subordinated Debt       $ 250,000      
Stated percentage on debt instrument       2.875%      
Maturity date       Dec. 15, 2031      
StellarOne Bank and Xenith | Trust Preferred Capital Notes              
Subordinated Borrowing [Line Items]              
Trust preferred capital notes principal balance       $ 58,500      
Trust preferred securities acquired       $ 87,000      
Access National Bank              
Subordinated Borrowing [Line Items]              
Trust preferred securities acquired   $ 5,000