INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
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

Investments, Unrealized Loss Position [Line Items]

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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