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INVESTMENT SECURITIES - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 1,583,805 | $ 1,624,906
Gross Unrealized Gains | 1,412 | 422
Gross Unrealized Losses | 198,314 | 238,853
Fair Value | 1,386,903 | 1,386,475
Held to maturity securities |  |
Amortized Cost | 1,995,733 | 2,074,465
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,995,488 | 2,074,220
Gross Unrealized Gains | 684 | 299
Gross Unrealized Losses | 289,353 | 351,244
Fair Value | 1,707,064 | 1,723,520
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 90,304 | 95,462
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 12,407 | 16,081
Fair Value | 77,897 | 79,381
Held to maturity securities |  |
Amortized Cost | 330,430 | 345,531
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 330,430 | 345,531
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 50,255 | 63,112
Fair Value | 280,175 | 282,419
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 990,867 | 996,541
Gross Unrealized Gains | 92 | 19
Gross Unrealized Losses | 116,383 | 133,386
Fair Value | 874,576 | 863,174
Held to maturity securities |  |
Amortized Cost | 1,072,380 | 1,085,921
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,072,135 | 1,085,676
Gross Unrealized Gains | 684 | 299
Gross Unrealized Losses | 163,944 | 185,784
Fair Value | 909,120 | 900,436
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 491,164 | 519,943
Gross Unrealized Gains | 1,320 | 403
Gross Unrealized Losses | 69,146 | 88,724
Fair Value | 423,338 | 431,622
Held to maturity securities |  |
Amortized Cost | 592,923 | 641,513
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 592,923 | 641,513
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 75,154 | 102,343
Fair Value | 517,769 | 539,170
Foreign investment |  |
Available for sale securities |  |
Amortized Cost | 1,500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 1,500 |
Held to maturity securities |  |
Amortized Cost |  | 1,500
Allowance for Credit Losses |  | 0
Net Carrying Amount |  | 1,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 5
Fair Value |  | 1,495
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 9,970 | 12,960
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 378 | 662
Fair Value | $ 9,592 | $ 12,298

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