Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Narrative) (Details)

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BORROWINGS (Narrative) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Subordinated Borrowing [Line Items]    
Remaining available balance for the federal funds lines $ 737,000 $ 1,000,000
Maximum collateral dependent line of credit with the FHLB 6,200,000 6,000,000
Remaining credit availability on collateral dependent line of credit with the FHLB 5,700,000 4,900,000
Trust Preferred Capital Securities 150,500 150,500
Fair value discount 14,426 15,296
Subordinated Debt 250,000 250,000
Remaining borrowing capacity 25,000 25,000
Federal Reserve Bank Term Funding Program    
Subordinated Borrowing [Line Items]    
Additional funding available 531,000  
Acquired Trust Preferred Capital Notes    
Subordinated Borrowing [Line Items]    
Fair value discount 11,900 12,500
2031 Subordinate Debt    
Subordinated Borrowing [Line Items]    
Subordinated Debt $ 250,000 $ 250,000
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  
Previous bank acquisitions | Acquired Trust Preferred Capital Notes    
Subordinated Borrowing [Line Items]    
Trust Preferred Capital Securities $ 92,000