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INVESTMENTS (Summary of Amortized Cost and Fair Value of Held to Maturity Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost $ 549,961 $ 546,583
Unrealized Gains 103 763
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (66,517) (41,153)
Held-to-maturity securities, fair value 483,547 506,193
Obligations of U.S. government-sponsored enterprises    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 7,559 7,457
Unrealized Gains 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (876) (777)
Held-to-maturity securities, fair value 6,683 6,680
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 1,000 1,100
Obligations of states and political subdivisions    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 56,191 55,978
Unrealized Gains 0 431
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5,441) (1,610)
Held-to-maturity securities, fair value 50,750 54,799
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 5,800 6,100
MBS issued or guaranteed by U.S. government-sponsored enterprises    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 307,846 317,406
Unrealized Gains 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (38,755) (24,766)
Held-to-maturity securities, fair value 269,091 292,640
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 35,500 38,400
CMO issued or guaranteed by U.S. government-sponsored enterprises    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 159,322 145,069
Unrealized Gains 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (20,135) (13,724)
Held-to-maturity securities, fair value 139,187 131,345
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss 18,900 20,700
Corporate bonds    
Schedule of Investments [Line Items]    
Held-to-maturity securities, at amortized cost 19,043 20,673
Unrealized Gains 103 332
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,310) (276)
Held-to-maturity securities, fair value 17,836 20,729
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss $ 93 $ 117