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DEBT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 3,495,649 | $ 3,140,305
Gross Unrealized Gains | 39,236 | 2,828
Gross Unrealized Losses | (44,407) | (77,882)
Fair Value | 3,490,478 | 3,065,251
Securities held-to-maturity |  |
Amortized Cost | 1,363,636 | 1,440,494
Gross Unrealized Gains | 503 | 509
Gross Unrealized Losses | (177,879) | (245,003)
Fair Value | 1,186,260 | 1,196,000
Obligations of states and political subdivisions |  |
Securities available-for-sale: |  |
Amortized Cost | 459,834 | 91,799
Gross Unrealized Gains | 8,954 | 699
Gross Unrealized Losses | (918) | (1,199)
Fair Value | 467,870 | 91,299
Securities held-to-maturity |  |
Amortized Cost | 15,082 | 14,193
Gross Unrealized Gains | 503 | 509
Gross Unrealized Losses | (9) | (30)
Fair Value | 15,576 | 14,672
Mortgage-backed securities - residential |  |
Securities available-for-sale: |  |
Amortized Cost | 2,373,146 | 2,694,745
Gross Unrealized Gains | 28,273 | 2,107
Gross Unrealized Losses | (27,264) | (53,164)
Fair Value | 2,374,155 | 2,643,688
Securities held-to-maturity |  |
Amortized Cost | 1,037,566 | 1,115,389
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (144,497) | (196,949)
Fair Value | 893,069 | 918,440
Mortgage-backed securities - commercial |  |
Securities available-for-sale: |  |
Amortized Cost | 389,469 | 259,793
Gross Unrealized Gains | 1,402 | 22
Gross Unrealized Losses | (12,693) | (18,953)
Fair Value | 378,178 | 240,862
Securities held-to-maturity |  |
Amortized Cost | 310,988 | 310,912
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (33,373) | (48,024)
Fair Value | 277,615 | 262,888
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 188,500 | 50,000
Gross Unrealized Gains | 189 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 188,689 | 50,000
Corporate bonds |  |
Securities available-for-sale: |  |
Amortized Cost | 56,558 | 43,968
Gross Unrealized Gains | 417 | 0
Gross Unrealized Losses | (3,491) | (4,566)
Fair Value | 53,484 | $ 39,402
U.S. Treasury securities |  |
Securities available-for-sale: |  |
Amortized Cost | 20,597 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (18) |
Fair Value | 20,579 |
Agency debentures |  |
Securities available-for-sale: |  |
Amortized Cost | 7,545 |
Gross Unrealized Gains | 1 |
Gross Unrealized Losses | (23) |
Fair Value | $ 7,523 |

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