INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available for sale securities
Amortized Cost	$ 1,884,215	$ 1,846,840
Gross Unrealized Gains	401	826
Gross Unrealized Losses	265,723	220,554
Fair Value	1,618,893	1,627,112
Held to maturity securities
Amortized Cost	2,134,440	2,184,497
Allowance for Credit Losses	245	245
Net Carrying Amount	2,134,195	2,184,252
Gross Unrealized Gains	300	1,625
Gross Unrealized Losses	355,524	315,748
Fair Value	1,779,216	1,870,374
U.S. Government-sponsored agency securities
Available for sale securities
Amortized Cost	108,842	111,521
Gross Unrealized Gains	0	0
Gross Unrealized Losses	17,565	16,214
Fair Value	91,277	95,307
Held to maturity securities
Amortized Cost	365,081	374,002
Allowance for Credit Losses	0	0
Net Carrying Amount	365,081	374,002
Gross Unrealized Gains	0	0
Gross Unrealized Losses	66,005	64,159
Fair Value	299,076	309,843
State and municipal
Available for sale securities
Amortized Cost	1,178,364	1,181,029
Gross Unrealized Gains	25	364
Gross Unrealized Losses	153,482	116,222
Fair Value	1,024,907	1,065,171
Held to maturity securities
Amortized Cost	1,091,714	1,099,201
Allowance for Credit Losses	245	245
Net Carrying Amount	1,091,469	1,098,956
Gross Unrealized Gains	300	1,625
Gross Unrealized Losses	183,892	152,113
Fair Value	908,122	948,713
U.S. Government-sponsored mortgage-backed securities
Available for sale securities
Amortized Cost	584,055	541,343
Gross Unrealized Gains	376	462
Gross Unrealized Losses	93,777	86,990
Fair Value	490,654	454,815
Held to maturity securities
Amortized Cost	676,145	709,794
Allowance for Credit Losses	0	0
Net Carrying Amount	676,145	709,794
Gross Unrealized Gains	0	0
Gross Unrealized Losses	105,607	99,448
Fair Value	570,538	610,346
Corporate obligations
Available for sale securities
Amortized Cost	12,954	12,947
Gross Unrealized Gains	0	0
Gross Unrealized Losses	899	1,128
Fair Value	12,055	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	20	28
Fair Value	$ 1,480	$ 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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