INVESTMENT SECURITIES - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Available for sale securities
Amortized Cost	$ 1,555,699	$ 1,574,023
Gross Unrealized Gains	1,117	1,826
Gross Unrealized Losses	(172,424)	(168,747)
Fair Value	1,384,392	1,407,102
Held to maturity securities
Amortized Cost	1,907,929	1,971,784
Allowance for Credit Losses	(245)	(245)
Net Carrying Amount	1,907,684	1,971,539
Gross Unrealized Gains	489	868
Gross Unrealized Losses	(254,475)	(254,365)
Fair Value	1,653,943	1,718,287
U.S. Government-sponsored agency securities
Available for sale securities
Amortized Cost	83,118	87,936
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(11,379)	(11,837)
Fair Value	71,739	76,099
Held to maturity securities
Amortized Cost	313,105	324,643
Allowance for Credit Losses	0	0
Net Carrying Amount	313,105	324,643
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(43,984)	(46,693)
Fair Value	269,121	277,950
State and municipal
Available for sale securities
Amortized Cost	988,306	993,911
Gross Unrealized Gains	133	225
Gross Unrealized Losses	(95,307)	(91,842)
Fair Value	893,132	902,294
Held to maturity securities
Amortized Cost	1,058,396	1,069,653
Allowance for Credit Losses	(245)	(245)
Net Carrying Amount	1,058,151	1,069,408
Gross Unrealized Gains	489	868
Gross Unrealized Losses	(138,678)	(137,706)
Fair Value	920,207	932,815
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Amortized Cost	474,786	482,702
Gross Unrealized Gains	984	1,600
Gross Unrealized Losses	(65,551)	(64,792)
Fair Value	410,219	419,510
Held to maturity securities
Amortized Cost	536,428	577,488
Allowance for Credit Losses	0	0
Net Carrying Amount	536,428	577,488
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(71,813)	(69,966)
Fair Value	464,615	507,522
Foreign investment
Available for sale securities
Amortized Cost	1,500	1,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	1,500	1,500
Corporate obligations
Available for sale securities
Amortized Cost	7,989	7,974
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(187)	(276)
Fair Value	$ 7,802	$ 7,699

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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