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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
security
Jun. 30, 2023
USD ($)
security
Dec. 31, 2023
USD ($)
EQUITY          
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value     $ 3,505 $ 3,644  
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable   Accrued interest receivable    
Available for sale accrued interest receivable $ 4,300   $ 4,300   $ 4,000
Number of AFS securities sold | security     0 0  
Available-for-sale debt securities, at fair value 676,719   $ 676,719   647,210
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right          
EQUITY          
Available-for-sale debt securities, at fair value 758,900   758,900   $ 990,400
Net unrealized gains on investment securities          
EQUITY          
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value (1,867) $ (1,976) (3,505) $ (3,644)  
Interest rate swap agreements | Derivative Financial Instruments Designated as Hedging Instruments          
EQUITY          
Notional amount $ 115,500   $ 115,500    
Fixed interest rate 2.095%   2.095%    
Interest rate swap agreements | Derivative Financial Instruments Designated as Hedging Instruments | Derivatives Not in Cash Flow Hedging Relationship          
EQUITY          
Unrealized gain (loss) on interest rate locks $ 884 $ (116) $ 776 $ (59)