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 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Feb. 01, 2019
Subordinated Borrowing [Line Items]          
Remaining available balance for the federal funds lines $ 997,000   $ 997,000    
Maximum collateral dependent line of credit with the FHLB 6,000,000        
Trust Preferred Capital Securities 150,500   150,500    
Fair value discount 16,154   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 13,100   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%    
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