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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

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