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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 | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities available for sale |  |
Amortized Cost | $ 2,394,664 | $ 2,039,952
Gross unrealized gains | 5,356 | 594
Gross unrealized losses | (182,232) | (230,325)
Fair Value | 2,217,788 | 1,810,221
Debt securities held to maturity |  |
Amortized Cost | 802,965 | 826,630
Gross unrecognized gains | 0 | 0
Gross unrecognized losses | (132,433) | (151,577)
Fair Value | 670,532 | 675,053
Obligations of U.S. government corporations and agencies |  |
Debt securities available for sale |  |
Amortized Cost | 115,902 | 1,408
Gross unrealized gains | 59 | 0
Gross unrealized losses | (404) | (8)
Fair Value | 115,557 | 1,400
Obligations of states and political subdivisions |  |
Debt securities available for sale |  |
Amortized Cost | 260,997 | 156,534
Gross unrealized gains | 131 | 31
Gross unrealized losses | (18,975) | (16,736)
Fair Value | 242,153 | 139,829
Asset-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 373,231 | 336,379
Gross unrealized gains | 390 | 181
Gross unrealized losses | 0 | (3)
Fair Value | 373,621 | 336,557
Commercial mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 149,844 | 107,305
Gross unrealized gains | 479 | 0
Gross unrealized losses | (12,297) | (15,131)
Fair Value | 138,026 | 92,174
Debt securities held to maturity |  |
Amortized Cost | 407,401 | 415,530
Gross unrecognized gains | 0 | 0
Gross unrecognized losses | (70,772) | (77,242)
Fair Value | 336,629 | 338,288
Residential mortgage-backed securities |  |
Debt securities available for sale |  |
Amortized Cost | 1,433,077 | 1,279,090
Gross unrealized gains | 3,870 | 19
Gross unrealized losses | (147,818) | (191,899)
Fair Value | 1,289,129 | 1,087,210
Debt securities held to maturity |  |
Amortized Cost | 395,564 | 411,100
Gross unrecognized gains | 0 | 0
Gross unrecognized losses | (61,661) | (74,335)
Fair Value | 333,903 | 336,765
Corporate debt securities |  |
Debt securities available for sale |  |
Amortized Cost | 61,613 | 159,236
Gross unrealized gains | 427 | 363
Gross unrealized losses | (2,738) | (6,548)
Fair Value | $ 59,302 | $ 153,051

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