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INVESTMENT SECURITIES (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
USD ($)
security
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
investment
Dec. 31, 2023
USD ($)
EQUITY        
Investment securities classified from available-for-sale to held-to-maturity | investment     81  
Investment securities, amortized cost basis     $ 762,700  
Held to maturity debt securities, fair value $ 541,685   673,200 $ 565,178
Net unrealized loss from transfer of securities     $ 89,500  
Accrued interest receivable on HTM debt securities 1,200     1,200
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value $ 1,638 $ 1,668    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Accrued interest receivable      
Available for sale accrued interest receivable $ 2,900     3,200
Number of AFS securities sold | security 0 0    
Available-for-sale debt securities, at fair value $ 660,833     647,210
Collateralized Mortgage-Backed Securities | Asset Pledged as Collateral without Right        
EQUITY        
Available-for-sale debt securities, at fair value 966,200     $ 990,400
Net unrealized gains on investment securities        
EQUITY        
Amortization of unrealized losses on investment securities transferred to held-to-maturity at fair value $ (1,638) $ (1,668)