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DEBT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 3,952,753 | $ 3,980,151
Gross Unrealized Gains | 29,170 | 52,604
Gross Unrealized Losses | (48,218) | (39,370)
Fair Value | 3,933,705 | 3,993,385
Securities held-to-maturity |  |
Amortized Cost | 1,313,520 | 1,336,632
Gross Unrealized Gains | 401 | 545
Gross Unrealized Losses | (163,952) | (166,359)
Fair Value | 1,149,969 | 1,170,818
Obligations of states and political subdivisions |  |
Securities available-for-sale: |  |
Amortized Cost | 454,978 | 458,290
Gross Unrealized Gains | 6,612 | 13,518
Gross Unrealized Losses | (1,721) | (649)
Fair Value | 459,869 | 471,159
Securities held-to-maturity |  |
Amortized Cost | 12,967 | 12,902
Gross Unrealized Gains | 401 | 545
Gross Unrealized Losses | (9) | (6)
Fair Value | 13,359 | 13,441
Mortgage-backed securities - residential |  |
Securities available-for-sale: |  |
Amortized Cost | 2,818,727 | 2,871,733
Gross Unrealized Gains | 20,363 | 36,881
Gross Unrealized Losses | (31,371) | (24,325)
Fair Value | 2,807,719 | 2,884,289
Securities held-to-maturity |  |
Amortized Cost | 989,514 | 1,012,716
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (132,144) | (134,994)
Fair Value | 857,370 | 877,722
Mortgage-backed securities - commercial |  |
Securities available-for-sale: |  |
Amortized Cost | 369,056 | 381,934
Gross Unrealized Gains | 1,210 | 1,622
Gross Unrealized Losses | (12,285) | (11,750)
Fair Value | 357,981 | 371,806
Securities held-to-maturity |  |
Amortized Cost | 311,039 | 311,014
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (31,799) | (31,359)
Fair Value | 279,240 | 279,655
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 230,500 | 188,500
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (792) | (185)
Fair Value | 229,708 | 188,316
Corporate bonds |  |
Securities available-for-sale: |  |
Amortized Cost | 52,028 | 51,828
Gross Unrealized Gains | 985 | 527
Gross Unrealized Losses | (1,878) | (2,440)
Fair Value | 51,135 | 49,915
U.S. Treasury securities |  |
Securities available-for-sale: |  |
Amortized Cost | 20,648 | 20,623
Gross Unrealized Gains | 0 | 46
Gross Unrealized Losses | (112) | 0
Fair Value | 20,536 | 20,669
Agency debentures |  |
Securities available-for-sale: |  |
Amortized Cost | 6,816 | 7,243
Gross Unrealized Gains | 0 | 9
Gross Unrealized Losses | (59) | (21)
Fair Value | $ 6,757 | $ 7,231

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