Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Feb. 01, 2019
Subordinated Borrowing [Line Items]        
Remaining available balance for the federal funds lines $ 1,000,000   $ 997,000  
Maximum collateral dependent line of credit with the FHLB 5,900,000   6,000,000  
Trust Preferred Capital Securities 150,500   150,500  
Fair value discount 15,869   16,435  
Subordinated Debt 250,000   250,000  
Long-term debt, early repayments 0 $ 214,695    
Remaining borrowing capacity 25,000   25,000  
Acquired Trust Preferred Capital Notes        
Subordinated Borrowing [Line Items]        
Fair value discount 12,900   13,300  
2026 Subordinate Debt        
Subordinated Borrowing [Line Items]        
Subordinated Debt     $ 150,000  
Stated percentage on debt instrument     5.00%  
2031 Subordinate Debt        
Subordinated Borrowing [Line Items]        
Proceeds from issuance of long-term borrowings     $ 246,900  
Subordinated Debt $ 250,000   $ 250,000  
Stated percentage on debt instrument 2.875%   2.875%  
Three-month LIBOR rate plus 0.00%   0.00%  
Maturity date Dec. 15, 2031   Dec. 15, 2031  
Previous bank acquisitions | Trust Preferred Capital Notes        
Subordinated Borrowing [Line Items]        
Trust Preferred Capital Securities $ 58,500      
Previous bank acquisitions | Acquired Trust Preferred Capital Notes        
Subordinated Borrowing [Line Items]        
Trust Preferred Capital Securities $ 87,000      
Access National Bank | Acquired Trust Preferred Capital Notes        
Subordinated Borrowing [Line Items]        
Trust Preferred Capital Securities       $ 5,000