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INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities held-to-maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost $ 478,886 $ 510,425
Total Securities 396,300 437,300
Held-to-maturity Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 478,886 510,425
Gross Unrealized/Unrecognized Gains   0
Gross Unrealized/Unrecognized Losses (82,628) (73,135)
Total Securities 396,258 437,290
Held-to-maturity Securities | US Treasury Securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 29,884 29,852
Gross Unrealized/Unrecognized Gains   0
Gross Unrealized/Unrecognized Losses (1,965) (2,223)
Total Securities 27,919 27,629
Held-to-maturity Securities | U.S. State and Municipal securities    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 15,631 15,814
Gross Unrealized/Unrecognized Gains   0
Gross Unrealized/Unrecognized Losses (2,951) (2,609)
Total Securities 12,680 13,205
Held-to-maturity Securities | Residential MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 425,276 456,648
Gross Unrealized/Unrecognized Gains   0
Gross Unrealized/Unrecognized Losses (76,294) (67,027)
Total Securities 348,982 389,621
Held-to-maturity Securities | Commercial MBS    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized Cost 8,095 8,111
Gross Unrealized/Unrecognized Gains   0
Gross Unrealized/Unrecognized Losses (1,418) (1,276)
Total Securities $ 6,677 $ 6,835