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SHORT-TERM BORROWINGS AND LONG-TERM DEBT (Narrative) (Details)
 1 Months Ended 12 Months Ended
Oct. 20, 2020
USD ($)
Dec. 31, 2004
USD ($)
Sep. 30, 2004
USD ($)
Dec. 31, 2023
USD ($)
period
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
SHORT-TERM BORROWINGS            
Maximum borrowing capacity       $ 1,930,000,000    
FHLB advances and other short-term borrowings       0 $ 5,000,000 $ 0
Investments       1,387,288,000    
Interest on short-term borrowings       1,139,000 1,055,000 2,000
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       156,102,000 105,859,000  
Interest on long-term debt       8,633,000 4,930,000 4,097,000
Unamortized debt issuance costs       445,000 688,000  
Central Bank | Federal Reserve Bank Advances            
SHORT-TERM BORROWINGS            
Additional unused borrowings available       285,800,000 75,900,000  
Federal Home Loan Bank Borrowings            
SHORT-TERM BORROWINGS            
Standby letters of credit issued       72,000,000 36,000,000  
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral            
SHORT-TERM BORROWINGS            
Loans, net of ACL       3,160,000,000    
Federal Reserve Bank Advances | Asset Pledged as Collateral            
SHORT-TERM BORROWINGS            
Loans, net of ACL       135,100,000 125,000,000  
Investments       196,700,000 0  
FHLB advances            
SHORT-TERM BORROWINGS            
Additional unused borrowings available       1,810,000,000    
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       50,000,000 0  
Interest on long-term debt       1,900,000 $ 0 $ 0
Junior Subordinated Debt | Trust IV            
SHORT-TERM BORROWINGS            
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       $ 30,900,000    
Trust preferred securities issued     $ 30,000,000      
Variable rate basis     three-month LIBOR      
Common securities issued to the Company     $ 900,000      
Junior Subordinated Debt | Trust IV | London Interbank Offered Rate (LIBOR)            
SHORT-TERM BORROWINGS            
Basis spread on variable rate     2.45%   0.0245%  
Junior Subordinated Debt | Trust IV | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
SHORT-TERM BORROWINGS            
Basis spread on variable rate       0.0026%    
Junior Subordinated Debt | Trust V            
SHORT-TERM BORROWINGS            
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       $ 20,600,000    
Trust preferred securities issued   $ 20,000,000        
Variable rate basis   three-month LIBOR        
Common securities issued to the Company   $ 600,000        
Junior Subordinated Debt | Trust V | London Interbank Offered Rate (LIBOR)            
SHORT-TERM BORROWINGS            
Basis spread on variable rate   1.87%     0.0187%  
Junior Subordinated Debt | Trust V | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
SHORT-TERM BORROWINGS            
Basis spread on variable rate       0.0026%    
Subordinated debentures            
SHORT-TERM BORROWINGS            
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       $ 51,547,000 $ 51,547,000  
Number of consecutive quarterly periods for which payments of interest can be deferred without default or penalty (up to) | period       20    
Subordinated debentures | Maximum            
SHORT-TERM BORROWINGS            
Redemption period of trust preferred securities, the subordinated debentures and the common securities, following the occurrence of certain events       90 days    
Senior Subordinated Notes            
SHORT-TERM BORROWINGS            
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       $ 54,555,000 54,312,000  
Unamortized debt issuance costs       445,000 $ 688,000  
Senior Subordinated Notes | Subordinated Notes            
SHORT-TERM BORROWINGS            
Long-term debt, net of unamortized debt issuance costs of $445 at December 31, 2023 and $688 at December 31, 2022       $ 54,600,000    
Debt face amount $ 55,000,000          
Debt instrument, term 10 years          
Stated interest rate, first five years 4.75%     0.0475% 0.0475%  
Unamortized debt issuance costs       $ 400,000    
Senior Subordinated Notes | Subordinated Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate            
SHORT-TERM BORROWINGS            
Basis spread on variable rate 4.56%     4.56% 4.56%