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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost $ 810,765 $ 754,950
Gross Unrealized Gains 3,099 507
Gross Unrealized Losses (90,411) (108,247)
Fair Value 723,453 647,210
ACL 0 0
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 606,117 632,338
Gross Unrecognized Gains 63 61
Gross Unrecognized Losses (59,190) (67,221)
Fair Value 546,990 565,178
ACL 0 0
States and political subdivisions    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 147,833 156,432
Gross Unrealized Gains 18 13
Gross Unrealized Losses (24,670) (29,810)
Fair Value 123,181 126,635
ACL 0 0
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 42,013 41,959
Gross Unrecognized Gains 0 0
Gross Unrecognized Losses (7,283) (6,706)
Fair Value 34,730 35,253
ACL 0 0
Corporate securities    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 35,373 35,731
Gross Unrealized Gains 0 0
Gross Unrealized Losses (2,819) (4,317)
Fair Value 32,554 31,414
ACL 0 0
U.S. Treasury and other government-sponsored entities and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 59,632 28,105
Gross Unrealized Gains 1,323 33
Gross Unrealized Losses (1,725) (1,941)
Fair Value 59,230 26,197
ACL 0 0
Residential - U.S. government-sponsored entities and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 433,493 441,898
Gross Unrealized Gains 857 95
Gross Unrealized Losses (48,054) (63,607)
Fair Value 386,296 378,386
ACL 0 0
Schedule of Held-to-Maturity Securities [Line Items]    
Amortized Cost 564,104 590,379
Gross Unrecognized Gains 63 61
Gross Unrecognized Losses (51,907) (60,515)
Fair Value 512,260 529,925
ACL 0 0
Residential - Non-government agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 18,085 19,322
Gross Unrealized Gains 471 366
Gross Unrealized Losses (722) (980)
Fair Value 17,834 18,708
ACL 0 0
Commercial - U.S. government-sponsored entities and agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 101,018 58,318
Gross Unrealized Gains 425 0
Gross Unrealized Losses (12,414) (7,404)
Fair Value 89,029 50,914
ACL 0 0
Commercial - Non-government agencies    
Debt Securities, Available-for-Sale [Line Items]    
Amortized Cost 15,331 15,144
Gross Unrealized Gains 5 0
Gross Unrealized Losses (7) (188)
Fair Value 15,329 14,956
ACL $ 0 $ 0