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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

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