INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available for sale securities
Amortized Cost	$ 1,618,983	$ 1,624,906
Gross Unrealized Gains	1,052	422
Gross Unrealized Losses	241,546	238,853
Fair Value	1,378,489	1,386,475
Held to maturity securities
Amortized Cost	2,048,877	2,074,465
Allowance for Credit Losses	245	245
Net Carrying Amount	2,048,632	2,074,220
Gross Unrealized Gains	148	299
Gross Unrealized Losses	344,019	351,244
Fair Value	1,705,006	1,723,520
U.S. Government-sponsored agency securities
Available for sale securities
Amortized Cost	93,758	95,462
Gross Unrealized Gains	0	0
Gross Unrealized Losses	13,832	16,081
Fair Value	79,926	79,381
Held to maturity securities
Amortized Cost	341,245	345,531
Allowance for Credit Losses	0	0
Net Carrying Amount	341,245	345,531
Gross Unrealized Gains	0	0
Gross Unrealized Losses	54,935	63,112
Fair Value	286,310	282,419
State and municipal
Available for sale securities
Amortized Cost	994,697	996,541
Gross Unrealized Gains	56	19
Gross Unrealized Losses	149,570	133,386
Fair Value	845,183	863,174
Held to maturity securities
Amortized Cost	1,079,688	1,085,921
Allowance for Credit Losses	245	245
Net Carrying Amount	1,079,443	1,085,676
Gross Unrealized Gains	148	299
Gross Unrealized Losses	200,377	185,784
Fair Value	879,459	900,436
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Amortized Cost	517,564	519,943
Gross Unrealized Gains	996	403
Gross Unrealized Losses	77,614	88,724
Fair Value	440,946	431,622
Held to maturity securities
Amortized Cost	626,444	641,513
Allowance for Credit Losses	0	0
Net Carrying Amount	626,444	641,513
Gross Unrealized Gains	0	0
Gross Unrealized Losses	88,705	102,343
Fair Value	537,739	539,170
Corporate obligations
Available for sale securities
Amortized Cost	12,964	12,960
Gross Unrealized Gains	0	0
Gross Unrealized Losses	530	662
Fair Value	12,434	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	2	5
Fair Value	$ 1,498	$ 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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