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INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Values of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 1,846,840 | $ 2,273,347
Gross Unrealized Gains | 826 | 439
Gross Unrealized Losses | 220,554 | 297,125
Fair Value | 1,627,112 | 1,976,661
Held to maturity securities |  |
Amortized Cost | 2,184,497 | 2,287,372
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,184,252 | 2,287,127
Gross Unrealized Gains | 1,625 | 647
Gross Unrealized Losses | 315,748 | 380,154
Fair Value | 1,870,374 | 1,907,865
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost |  | 2,501
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 42
Fair Value |  | 2,459
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 111,521 | 119,154
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 16,214 | 17,192
Fair Value | 95,307 | 101,962
Held to maturity securities |  |
Amortized Cost | 374,002 | 392,246
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 374,002 | 392,246
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 64,159 | 69,147
Fair Value | 309,843 | 323,099
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,181,029 | 1,530,048
Gross Unrealized Gains | 364 | 438
Gross Unrealized Losses | 116,222 | 178,726
Fair Value | 1,065,171 | 1,351,760
Held to maturity securities |  |
Amortized Cost | 1,099,201 | 1,117,552
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,098,956 | 1,117,307
Gross Unrealized Gains | 1,625 | 647
Gross Unrealized Losses | 152,113 | 197,064
Fair Value | 948,713 | 921,135
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 541,343 | 608,630
Gross Unrealized Gains | 462 | 1
Gross Unrealized Losses | 86,990 | 100,358
Fair Value | 454,815 | 508,273
Held to maturity securities |  |
Amortized Cost | 709,794 | 776,074
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 709,794 | 776,074
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 99,448 | 113,915
Fair Value | 610,346 | 662,159
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 12,947 | 13,014
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,128 | 807
Fair Value | 11,819 | 12,207
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 | 28 | 28
Fair Value | $ 1,472 | $ 1,472

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