INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Values of Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available for sale securities
Amortized Cost	$ 1,624,906	$ 1,846,840
Gross Unrealized Gains	422	826
Gross Unrealized Losses	238,853	220,554
Fair Value	1,386,475	1,627,112
Held to maturity securities
Amortized Cost	2,074,465	2,184,497
Allowance for Credit Losses	245	245
Net Carrying Amount	2,074,220	2,184,252
Gross Unrealized Gains	299	1,625
Gross Unrealized Losses	351,244	315,748
Fair Value	1,723,520	1,870,374
U.S. Government-sponsored agency securities
Available for sale securities
Amortized Cost	95,462	111,521
Gross Unrealized Gains	0	0
Gross Unrealized Losses	16,081	16,214
Fair Value	79,381	95,307
Held to maturity securities
Amortized Cost	345,531	374,002
Allowance for Credit Losses	0	0
Net Carrying Amount	345,531	374,002
Gross Unrealized Gains	0	0
Gross Unrealized Losses	63,112	64,159
Fair Value	282,419	309,843
State and municipal
Available for sale securities
Amortized Cost	996,541	1,181,029
Gross Unrealized Gains	19	364
Gross Unrealized Losses	133,386	116,222
Fair Value	863,174	1,065,171
Held to maturity securities
Amortized Cost	1,085,921	1,099,201
Allowance for Credit Losses	245	245
Net Carrying Amount	1,085,676	1,098,956
Gross Unrealized Gains	299	1,625
Gross Unrealized Losses	185,784	152,113
Fair Value	900,436	948,713
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Amortized Cost	519,943	541,343
Gross Unrealized Gains	403	462
Gross Unrealized Losses	88,724	86,990
Fair Value	431,622	454,815
Held to maturity securities
Amortized Cost	641,513	709,794
Allowance for Credit Losses	0	0
Net Carrying Amount	641,513	709,794
Gross Unrealized Gains	0	0
Gross Unrealized Losses	102,343	99,448
Fair Value	539,170	610,346
Corporate obligations
Available for sale securities
Amortized Cost	12,960	12,947
Gross Unrealized Gains	0	0
Gross Unrealized Losses	662	1,128
Fair Value	12,298	11,819
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	5	28
Fair Value	$ 1,495	$ 1,472

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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