INVESTMENT SECURITIES - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Available for sale securities
Amortized Cost	$ 1,598,205	$ 1,624,906
Gross Unrealized Gains	1,213	422
Gross Unrealized Losses	241,288	238,853
Fair Value	1,358,130	1,386,475
Held to maturity securities
Amortized Cost	2,023,071	2,074,465
Allowance for Credit Losses	245	245
Net Carrying Amount	2,022,826	2,074,220
Gross Unrealized Gains	259	299
Gross Unrealized Losses	336,090	351,244
Fair Value	1,687,240	1,723,520
U.S. Government-sponsored agency securities
Available for sale securities
Amortized Cost	91,585	95,462
Gross Unrealized Gains	0	0
Gross Unrealized Losses	13,346	16,081
Fair Value	78,239	79,381
Held to maturity securities
Amortized Cost	334,970	345,531
Allowance for Credit Losses	0	0
Net Carrying Amount	334,970	345,531
Gross Unrealized Gains	0	0
Gross Unrealized Losses	52,156	63,112
Fair Value	282,814	282,419
State and municipal
Available for sale securities
Amortized Cost	992,236	996,541
Gross Unrealized Gains	41	19
Gross Unrealized Losses	152,264	133,386
Fair Value	840,013	863,174
Held to maturity securities
Amortized Cost	1,076,773	1,085,921
Allowance for Credit Losses	245	245
Net Carrying Amount	1,076,528	1,085,676
Gross Unrealized Gains	259	299
Gross Unrealized Losses	201,668	185,784
Fair Value	875,364	900,436
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Amortized Cost	503,417	519,943
Gross Unrealized Gains	1,172	403
Gross Unrealized Losses	75,128	88,724
Fair Value	429,461	431,622
Held to maturity securities
Amortized Cost	609,828	641,513
Allowance for Credit Losses	0	0
Net Carrying Amount	609,828	641,513
Gross Unrealized Gains	0	0
Gross Unrealized Losses	82,266	102,343
Fair Value	527,562	539,170
Corporate obligations
Available for sale securities
Amortized Cost	10,967	12,960
Gross Unrealized Gains	0	0
Gross Unrealized Losses	550	662
Fair Value	10,417	12,298
Foreign investment
Held to maturity securities
Amortized Cost	1,500	1,500
Allowance for Credit Losses	0	0
Net Carrying Amount	1,500	1,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	5
Fair Value	$ 1,500	$ 1,495

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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