INVESTMENT SECURITIES - Schedule of Gross Unrealized Losses and Fair Value of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Estimated Fair Value
Less Than 12 Months	$ 1,405,288	$ 6,826
12 Months or More	27,331	3,953
Total	1,432,619	10,779
Unrealized Losses
Less Than 12 Months	(56,816)	(12)
12 Months or More	(2,318)	(183)
Total	(59,134)	(195)
U.S. Treasuries
Estimated Fair Value
Less Than 12 Months	725,250
12 Months or More	0
Total	725,250
Unrealized Losses
Less Than 12 Months	(16,381)
12 Months or More	0
Total	(16,381)
U.S. government-sponsored agencies
Estimated Fair Value
Less Than 12 Months	979
12 Months or More	0
Total	979
Unrealized Losses
Less Than 12 Months	(57)
12 Months or More	0
Total	(57)
State, county and municipal securities
Estimated Fair Value
Less Than 12 Months	27,438
12 Months or More	0
Total	27,438
Unrealized Losses
Less Than 12 Months	(1,180)
12 Months or More	0
Total	(1,180)
Corporate debt securities
Estimated Fair Value
Less Than 12 Months	13,271	0
12 Months or More	1,155	1,380
Total	14,426	1,380
Unrealized Losses
Less Than 12 Months	(126)	0
12 Months or More	(270)	(120)
Total	(396)	(120)
SBA pool securities
Estimated Fair Value
Less Than 12 Months	17,806	1,312
12 Months or More	9,329	2,572
Total	27,135	3,884
Unrealized Losses
Less Than 12 Months	(1,298)	(6)
12 Months or More	(729)	(63)
Total	(2,027)	(69)
Mortgage-backed securities
Estimated Fair Value
Less Than 12 Months	620,544	5,514
12 Months or More	16,847	1
Total	637,391	5,515
Unrealized Losses
Less Than 12 Months	(37,774)	(6)
12 Months or More	(1,319)	0
Total	$ (39,093)	$ (6)