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INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,479,508		$ 2,193,215
Allowance for Credit Losses	(68)	$ (69)	(75)	$ (66)	$ (69)	$ (69)
Gross Unrealized Gains	10,506		30,187
Gross Unrealized Losses	(29,323)		(16,154)
Estimated Fair Value	2,460,623		2,207,173
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	584,558		653,888
Allowance for Credit Losses	0		0
Gross Unrealized Gains	1,298		7,578
Gross Unrealized Losses	(2,409)		(841)
Estimated Fair Value	583,447		660,625
State, county and municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18,005		19,493
Allowance for Credit Losses	0		0
Gross Unrealized Gains	5		6
Gross Unrealized Losses	(547)		(438)
Estimated Fair Value	17,463		19,061
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,894		6,395
Allowance for Credit Losses	(68)		(75)
Gross Unrealized Gains	0		9
Gross Unrealized Losses	(374)		(454)
Estimated Fair Value	2,452		5,875
SBA pool securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,146		12,795
Allowance for Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(627)		(587)
Estimated Fair Value	10,519		12,208
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,862,905		1,500,644
Allowance for Credit Losses	0		0
Gross Unrealized Gains	9,203		22,594
Gross Unrealized Losses	(25,366)		(13,834)
Estimated Fair Value	$ 1,846,742		$ 1,509,404