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BORROWINGS AND RELATED INTEREST (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Sep. 30, 2003
Debt Instrument [Line Items]              
Loans, gross $ 6,684,965     $ 6,684,965   $ 6,402,586  
Trust redeemable preferred securities issued             $ 35,000
Gain from early debt extinguishment $ 0   $ 0 $ 42 $ 0    
Advances from the Federal Home Loan Bank              
Debt Instrument [Line Items]              
Minimum amount of qualifying collateral 110.00%     110.00%      
Additional borrowing capacity $ 682,300     $ 682,300   $ 697,300  
Weighted average period remaining maturity of FHLB advances       1 day   3 days  
Original debt instrument term of FHLB advances       1 month      
Accrued interest payable 65     $ 65   $ 8  
Advances from the Federal Home Loan Bank | Asset Pledged as Collateral              
Debt Instrument [Line Items]              
Loans, gross $ 974,800     $ 974,800   $ 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 from early debt extinguishment   $ 42          
Effective interest rate   3.23%          
Junior Subordinated Debt | LIBOR              
Debt Instrument [Line Items]              
Basis spread on variable rate   2.95%