SECURITIES - Schedule of Amortized Cost and Fair Value of Available-For-Sale Securities and Held-To-Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale securities:
Amortized Cost	$ 1,151,663	$ 1,161,172
Gross Unrealized Gains	3,298	537
Gross Unrealized Losses	94,947	122,387
Securities available-for-sale	1,060,014	1,039,322
Held-to-maturity:
Amortized Cost	602,328	654,539
Gross Unrealized Gains	8,994	9,566
Gross Unrealized Losses	36,572	48,161
Estimated Fair Value	574,750	615,944
U.S. Treasury
Available-for-sale securities:
Amortized Cost	5,294	16,985
Gross Unrealized Gains	0	0
Gross Unrealized Losses	113	310
Securities available-for-sale	5,181	16,675
Held-to-maturity:
Amortized Cost	52,207	89,688
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,306	2,804
Estimated Fair Value	50,901	86,884
Obligations of U.S. government agencies and sponsored entities
Available-for-sale securities:
Amortized Cost	109,409	119,868
Gross Unrealized Gains	0	1
Gross Unrealized Losses	10,829	14,946
Securities available-for-sale	98,580	104,923
Held-to-maturity:
Amortized Cost	32,946	33,659
Gross Unrealized Gains	3	0
Gross Unrealized Losses	1,003	1,803
Estimated Fair Value	31,946	31,856
Tax-exempt and taxable obligations of states and municipal subdivisions
Available-for-sale securities:
Amortized Cost	459,912	486,293
Gross Unrealized Gains	562	449
Gross Unrealized Losses	39,773	48,276
Securities available-for-sale	420,701	438,466
Held-to-maturity:
Amortized Cost	245,240	246,908
Gross Unrealized Gains	8,980	9,566
Gross Unrealized Losses	12,028	14,697
Estimated Fair Value	242,192	241,777
Mortgage-backed securities - residential
Available-for-sale securities:
Amortized Cost	312,607	297,735
Gross Unrealized Gains	282	11
Gross Unrealized Losses	26,419	34,430
Securities available-for-sale	286,470	263,316
Held-to-maturity:
Amortized Cost	131,045	141,573
Gross Unrealized Gains	0	0
Gross Unrealized Losses	11,177	14,237
Estimated Fair Value	119,868	127,336
Mortgage-backed securities - commercial
Available-for-sale securities:
Amortized Cost	228,888	198,944
Gross Unrealized Gains	2,454	76
Gross Unrealized Losses	15,377	20,675
Securities available-for-sale	215,965	178,345
Held-to-maturity:
Amortized Cost	130,890	132,711
Gross Unrealized Gains	11	0
Gross Unrealized Losses	9,408	12,334
Estimated Fair Value	121,493	120,377
Corporate obligations
Available-for-sale securities:
Amortized Cost	35,553	41,347
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,436	3,750
Securities available-for-sale	33,117	37,597
Held-to-maturity:
Amortized Cost	10,000	10,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,650	2,286
Estimated Fair Value	$ 8,350	$ 7,714