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INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 1,742,679 | $ 1,846,840
Gross Unrealized Gains | 2,542 | 826
Gross Unrealized Losses | 191,725 | 220,554
Fair Value | 1,553,496 | 1,627,112
Held to maturity securities |  |
Amortized Cost | 2,108,894 | 2,184,497
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,108,649 | 2,184,252
Gross Unrealized Gains | 1,157 | 1,625
Gross Unrealized Losses | 287,045 | 315,748
Fair Value | 1,823,006 | 1,870,374
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 97,670 | 111,521
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 12,637 | 16,214
Fair Value | 85,033 | 95,307
Held to maturity securities |  |
Amortized Cost | 361,335 | 374,002
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 361,335 | 374,002
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 53,432 | 64,159
Fair Value | 307,903 | 309,843
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,090,953 | 1,181,029
Gross Unrealized Gains | 95 | 364
Gross Unrealized Losses | 106,937 | 116,222
Fair Value | 984,111 | 1,065,171
Held to maturity securities |  |
Amortized Cost | 1,087,980 | 1,099,201
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,087,735 | 1,098,956
Gross Unrealized Gains | 1,157 | 1,625
Gross Unrealized Losses | 151,227 | 152,113
Fair Value | 937,910 | 948,713
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 541,099 | 541,343
Gross Unrealized Gains | 2,447 | 462
Gross Unrealized Losses | 71,500 | 86,990
Fair Value | 472,046 | 454,815
Held to maturity securities |  |
Amortized Cost | 658,079 | 709,794
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 658,079 | 709,794
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 82,382 | 99,448
Fair Value | 575,697 | 610,346
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 12,957 | 12,947
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 651 | 1,128
Fair Value | 12,306 | 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 | 4 | 28
Fair Value | $ 1,496 | $ 1,472

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