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DEBT SECURITIES - Schedule of Amortized Cost, Unrealized or Unrecognized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities available for sale |  |
Amortized Cost | $ 2,251,731 | $ 2,039,952
Gross unrealized gains | 9,753 | 594
Gross unrealized losses | (162,225) | (230,325)
Fair Value | 2,099,259 | 1,810,221
Debt securities held to maturity |  |
Amortized Cost | 784,821 | 826,630
Gross unrecognized gains | 0 | 0
Gross unrecognized losses | (125,350) | (151,577)
Fair Value | 659,471 | 675,053
Obligations of U.S. government corporations and agencies |  |
Debt securities available for sale |  |
Amortized Cost | 113,676 | 1,408
Gross unrealized gains | 124 | 0
Gross unrealized losses | (195) | (8)
Fair Value | 113,605 | 1,400
Obligations of states and political subdivisions |  |
Debt securities available for sale |  |
Amortized Cost | 259,470 | 156,534
Gross unrealized gains | 655 | 31
Gross unrealized losses | (12,581) | (16,736)
Fair Value | 247,544 | 139,829
Asset-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 285,052 | 336,379
Gross unrealized gains | 510 | 181
Gross unrealized losses | 0 | (3)
Fair Value | 285,562 | 336,557
Commercial mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 147,183 | 107,305
Gross unrealized gains | 541 | 0
Gross unrealized losses | (11,743) | (15,131)
Fair Value | 135,981 | 92,174
Debt securities held to maturity |  |
Amortized Cost | 398,375 | 415,530
Gross unrecognized gains | 0 | 0
Gross unrecognized losses | (68,743) | (77,242)
Fair Value | 329,632 | 338,288
Residential mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 1,395,849 | 1,279,090
Gross unrealized gains | 7,513 | 19
Gross unrealized losses | (135,786) | (191,899)
Fair Value | 1,267,576 | 1,087,210
Debt securities held to maturity |  |
Amortized Cost | 386,446 | 411,100
Gross unrecognized gains | 0 | 0
Gross unrecognized losses | (56,607) | (74,335)
Fair Value | 329,839 | 336,765
Corporate debt securities |  |
Debt securities available for sale |  |
Amortized Cost | 50,501 | 159,236
Gross unrealized gains | 410 | 363
Gross unrealized losses | (1,920) | (6,548)
Fair Value | $ 48,991 | $ 153,051

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