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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

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