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BORROWINGS AND RELATED INTEREST (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2003
Debt Instrument [Line Items]        
Loans, gross $ 6,835,322 $ 6,402,586    
Trust redeemable preferred securities issued   35,000   $ 35,000
Gain on early extinguishment of debt $ 42 (1,481) $ (63)  
Advances from the Federal Home Loan Bank        
Debt Instrument [Line Items]        
Minimum amount of qualifying collateral 110.00%      
Additional borrowing capacity $ 628,100 $ 697,300    
Weighted average period remaining maturity of FHLB advances 3 days 3 days    
Original debt instrument term of FHLB advances 1 month      
Accrued interest payable $ 103 $ 8    
Advances from the Federal Home Loan Bank | Asset Pledged as Collateral        
Debt Instrument [Line Items]        
Loans, gross 951,100 $ 949,000    
Junior Subordinated Debt        
Debt Instrument [Line Items]        
Par value of subordinated deferrable interest debenture 36,100     $ 36,100
Write off of unamortized issuance costs 405      
Gain on early extinguishment of debt $ 42      
Effective interest rate 3.23%      
Junior Subordinated Debt | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 2.95%