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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 80,976 $ 1,502,821
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,194) (89,206)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,739,797 1,785,690
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (364,126) (329,398)
Debt Securities, Available-for-Sale, Unrealized Loss Position 2,820,773 3,288,511
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (365,320) (418,604)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1,128 36,214
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 3,422
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 65,086 37,399
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 8,760 4,219
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 66,214 73,613
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 8,763 7,641
U.S. Treasuries    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 0 2,383
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 (46)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 31,243 30,313
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3,661) (4,570)
Debt Securities, Available-for-Sale, Unrealized Loss Position 31,243 32,696
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (3,661) (4,616)
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 69,780 66,468
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (12,010) (13,914)
Debt Securities, Available-for-Sale, Unrealized Loss Position 69,780 66,468
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (12,010) (13,914)
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 31,892 195,972
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (483) (10,413)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 538,863 443,415
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (85,049) (87,049)
Debt Securities, Available-for-Sale, Unrealized Loss Position 570,755 639,387
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (85,532) (97,462)
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 1,772 440,207
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (11) (18,823)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 495,451 175,530
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (35,900) (28,551)
Debt Securities, Available-for-Sale, Unrealized Loss Position 497,223 615,737
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (35,911) (47,374)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 17,656
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 2,197
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 28,298 13,593
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,628 1,917
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 28,298 31,249
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 4,628 4,114
Collateralized mortgage obligations    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 10,699 199,138
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (157) (12,453)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 393,884 269,242
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (60,120) (48,986)
Debt Securities, Available-for-Sale, Unrealized Loss Position 404,583 468,380
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (60,277) (61,439)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 6,317
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 606
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 7,431 2,136
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 539 221
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 7,431 8,453
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 539 827
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 15,155 295,913
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (132) (31,196)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 562,740 368,673
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (114,188) (92,972)
Debt Securities, Available-for-Sale, Unrealized Loss Position 577,895 664,586
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (114,320) (124,168)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1,128 5,160
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3 201
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,488 0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 212 0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 2,616 5,160
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss 215 201
Asset-backed Securities    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 6,853 250,946
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (15) (9,410)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 542,029 422,090
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (39,798) (51,565)
Debt Securities, Available-for-Sale, Unrealized Loss Position 548,882 673,036
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (39,813) (60,975)
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 14,605 118,262
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (396) (6,865)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 105,807 9,959
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (13,400) (1,791)
Debt Securities, Available-for-Sale, Unrealized Loss Position 120,412 128,221
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax (13,796) (8,656)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 0 7,081
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 418
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 27,869 21,670
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3,381 2,081
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 27,869 28,751
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss $ 3,381 $ 2,499