INVESTMENT SECURITIES - Schedule of Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,708,196	$ 1,447,637
Allowance for Credit Losses	(69)	(69)	$ (75)	$ 0
Gross Unrealized Gains	2,171	112
Gross Unrealized Losses	(39,038)	(44,736)
Estimated Fair Value	1,671,260	1,402,944
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	800,860	732,636
Allowance for Credit Losses	0	0
Gross Unrealized Gains	669	34
Gross Unrealized Losses	(5,065)	(11,793)
Estimated Fair Value	796,464	720,877
U.S. government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,010	1,023
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(16)	(38)
Estimated Fair Value	994	985
State, county and municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	25,802	28,986
Allowance for Credit Losses	0	0
Gross Unrealized Gains	8	9
Gross Unrealized Losses	(1,070)	(944)
Estimated Fair Value	24,740	28,051
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,946	10,946
Allowance for Credit Losses	(69)	(69)
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(594)	(850)
Estimated Fair Value	10,283	10,027
SBA pool securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	72,036	53,033
Allowance for Credit Losses	0	0
Gross Unrealized Gains	0	2
Gross Unrealized Losses	(1,554)	(1,519)
Estimated Fair Value	70,482	51,516
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	797,542	621,013
Allowance for Credit Losses	0	0
Gross Unrealized Gains	1,494	67
Gross Unrealized Losses	(30,739)	(29,592)
Estimated Fair Value	$ 768,297	$ 591,488