Annual report pursuant to Section 13 and 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Subordinated Borrowing [Line Items]      
Remaining available balance for the federal funds lines $ 682,000,000.0 $ 1,000,000,000.0  
Maximum collateral dependent line of credit with the FHLB 6,200,000,000 6,000,000,000.0  
Trust Preferred Capital Securities 150,500,000 150,500,000  
Fair value discount 14,134,000 15,296,000  
Net proceeds from issuance of long-term borrowings 0 0 $ 246,869,000
Subordinated Debt 250,000,000 250,000,000  
Long-term debt, early repayments 0 0 $ 364,695,000
Remaining borrowing capacity 25,000,000.0 25,000,000.0  
Federal Reserve Bank Term Funding Program      
Subordinated Borrowing [Line Items]      
Additional funding available 522,900,000    
FHLB Secured Line Of Credit      
Subordinated Borrowing [Line Items]      
Maximum collateral dependent line of credit with the FHLB 1,700,000,000 1,800,000,000  
Remaining credit availability on collateral dependent line of credit with the FHLB 989,000 814,000  
Acquired Trust Preferred Capital Notes      
Subordinated Borrowing [Line Items]      
Fair value discount 11,700,000 12,500,000  
2031 Subordinate Debt      
Subordinated Borrowing [Line Items]      
Fair value discount 2,500,000 2,800,000  
Subordinated Debt $ 250,000,000 $ 250,000,000  
Stated percentage on debt instrument 2.875% 2.875%  
Three-month CME SOFR 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 $ 58,500,000    
Previous bank acquisitions | Acquired Trust Preferred Capital Notes      
Subordinated Borrowing [Line Items]      
Trust Preferred Capital Securities $ 92,000,000.0