INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Estimated Fair Value
Less Than 12 Months	$ 507,188	$ 162,258
12 Months or More	878,229	1,154,553
Total	1,385,417	1,316,811
Unrealized Losses
Less Than 12 Months	(3,696)	(827)
12 Months or More	(35,342)	(43,909)
Total	(39,038)	(44,736)
U.S. Treasuries
Estimated Fair Value
Less Than 12 Months	272,564	159,667
12 Months or More	353,787	537,313
Total	626,351	696,980
Unrealized Losses
Less Than 12 Months	(1,376)	(827)
12 Months or More	(3,689)	(10,966)
Total	(5,065)	(11,793)
U.S. government-sponsored agencies
Estimated Fair Value
Less Than 12 Months	0	0
12 Months or More	994	985
Total	994	985
Unrealized Losses
Less Than 12 Months	0	0
12 Months or More	(16)	(38)
Total	(16)	(38)
State, county and municipal securities
Estimated Fair Value
Less Than 12 Months	3,953	1,923
12 Months or More	15,940	19,754
Total	19,893	21,677
Unrealized Losses
Less Than 12 Months	(17)	0
12 Months or More	(1,053)	(944)
Total	(1,070)	(944)
Corporate debt securities
Estimated Fair Value
Less Than 12 Months	383	500
12 Months or More	8,400	8,527
Total	8,783	9,027
Unrealized Losses
Less Than 12 Months	(13)	0
12 Months or More	(581)	(850)
Total	(594)	(850)
SBA pool securities
Estimated Fair Value
Less Than 12 Months	52,850	42
12 Months or More	17,491	21,267
Total	70,341	21,309
Unrealized Losses
Less Than 12 Months	(322)	0
12 Months or More	(1,232)	(1,519)
Total	(1,554)	(1,519)
Mortgage-backed securities
Estimated Fair Value
Less Than 12 Months	177,438	126
12 Months or More	481,617	566,707
Total	659,055	566,833
Unrealized Losses
Less Than 12 Months	(1,968)	0
12 Months or More	(28,771)	(29,592)
Total	$ (30,739)	$ (29,592)