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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Schedule of Held-to-Maturity Securities [Line Items]      
Amortized Cost $ 640,053 $ 664,883  
Gross Unrecognized Gains 0 0  
Gross Unrecognized Losses (108,166) (68,103)  
Fair Value 531,887 596,780 $ 673,200
ACL 0 0  
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 772,369 801,370  
Gross Unrealized Gains 5 6  
Gross Unrealized Losses (147,121) (129,582)  
Fair Value 625,253 671,794  
ACL 0 0  
States and political subdivisions      
Schedule of Held-to-Maturity Securities [Line Items]      
Amortized Cost 41,930 41,840  
Gross Unrecognized Gains 0 0  
Gross Unrecognized Losses (9,892) (4,727)  
Fair Value 32,038 37,113  
ACL 0 0  
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 164,527 172,427  
Gross Unrealized Gains 0 6  
Gross Unrealized Losses (39,550) (36,681)  
Fair Value 124,977 135,752  
ACL 0 0  
Residential - U.S. Government-sponsored enterprises      
Schedule of Held-to-Maturity Securities [Line Items]      
Amortized Cost 598,123 623,043  
Gross Unrecognized Gains 0 0  
Gross Unrecognized Losses (98,274) (63,376)  
Fair Value 499,849 559,667  
ACL 0 0  
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 467,300 498,989  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (88,428) (75,186)  
Fair Value 378,872 423,803  
ACL 0 0  
Corporate securities      
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 35,850 36,206  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (5,830) (5,995)  
Fair Value 30,020 30,211  
ACL 0 0  
U.S. Treasury obligations and direct obligations of U.S. Government agencies      
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 23,812 28,032  
Gross Unrealized Gains 5 0  
Gross Unrealized Losses (2,325) (2,317)  
Fair Value 21,492 25,715  
ACL 0 0  
Residential - Non-government agencies      
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 13,536 9,829  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (1,457) (1,167)  
Fair Value 12,079 8,662  
ACL 0 0  
Commercial - U.S. Government-sponsored enterprises      
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 52,263 54,346  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (9,215) (8,202)  
Fair Value 43,048 46,144  
ACL 0 0  
Commercial - Non-government agencies      
Debt Securities, Available-for-Sale [Line Items]      
Amortized Cost 15,081 1,541  
Gross Unrealized Gains 0 0  
Gross Unrealized Losses (316) (34)  
Fair Value 14,765 1,507  
ACL $ 0 $ 0