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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 620,715 | $ 80,976
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (11,525) | (1,194)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,911,161 | 2,739,797
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (320,809) | (364,126)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 2,531,876 | 2,820,773
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (332,334) | (365,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,111 | 1,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 33 | 3
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 63,315 | 65,086
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,980 | 8,760
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 66,426 | 66,214
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 8,013 | 8,763
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 90 | 31,243
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (9) | (3,661)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 90 | 31,243
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (9) | (3,661)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Securities of U.S. government agencies and corporations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 71,678 | 69,780
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (11,546) | (12,010)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 71,678 | 69,780
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (11,546) | (12,010)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Mortgage-backed securities-residential |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 417,516 | 31,892
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (9,130) | (483)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 503,321 | 538,863
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (95,078) | (85,049)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 920,837 | 570,755
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (104,208) | (85,532)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Mortgage-backed securities-commercial |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 26,516 | 1,772
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (67) | (11)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 286,589 | 495,451
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (25,314) | (35,900)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 313,105 | 497,223
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (25,381) | (35,911)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 25,990 | 28,298
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,454 | 4,628
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 25,990 | 28,298
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 4,454 | 4,628
Collateralized mortgage obligations |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 120,670 | 10,699
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1,776) | (157)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 296,813 | 393,884
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (50,823) | (60,120)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 417,483 | 404,583
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (52,599) | (60,277)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 6,219 | 7,431
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 788 | 539
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 6,219 | 7,431
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 788 | 539
Obligations of state and other political subdivisions |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 19,636 | 15,155
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (351) | (132)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 478,083 | 562,740
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (109,553) | (114,188)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 497,719 | 577,895
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (109,904) | (114,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,111 | 1,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 33 | 3
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 2,288 | 1,488
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 306 | 212
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 5,399 | 2,616
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 339 | 215
Asset-backed Securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 26,389 | 6,853
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (189) | (15)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 159,135 | 542,029
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (22,190) | (39,798)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 185,524 | 548,882
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (22,379) | (39,813)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | 0 | 0
Other securities |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 9,988 | 14,605
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (12) | (396)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 115,452 | 105,807
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (6,296) | (13,400)
Debt Securities, Available-for-Sale, Unrealized Loss Position | 125,440 | 120,412
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (6,308) | (13,796)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0 | 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 28,818 | 27,869
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,432 | 3,381
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 28,818 | 27,869
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | $ 2,432 | $ 3,381

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