INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 523,533	$ 620,715
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(2,200)	(11,525)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,587,302	1,911,161
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(227,996)	(320,809)
Debt Securities, Available-for-Sale, Unrealized Loss Position	2,110,835	2,531,876
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(230,196)	(332,334)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,273	3,111
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	33
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	47,336	63,315
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,267	7,980
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	49,609	66,426
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	4,271	8,013
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	95	90
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4)	(9)
Debt Securities, Available-for-Sale, Unrealized Loss Position	95	90
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(4)	(9)
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	0	71,678
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(11,546)
Debt Securities, Available-for-Sale, Unrealized Loss Position	0	71,678
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(11,546)
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	277,394	417,516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,349)	(9,130)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	536,694	503,321
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(68,418)	(95,078)
Debt Securities, Available-for-Sale, Unrealized Loss Position	814,088	920,837
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(69,767)	(104,208)
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	39,084	26,516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(108)	(67)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	166,649	286,589
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(13,633)	(25,314)
Debt Securities, Available-for-Sale, Unrealized Loss Position	205,733	313,105
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(13,741)	(25,381)
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	23,981	25,990
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,392	4,454
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	23,981	25,990
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	3,392	4,454
Collateralized mortgage obligations
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	56,942	120,670
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(130)	(1,776)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	286,606	296,813
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(36,217)	(50,823)
Debt Securities, Available-for-Sale, Unrealized Loss Position	343,548	417,483
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(36,347)	(52,599)
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	5,589	6,219
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	499	788
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	5,589	6,219
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	499	788
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	71,825	19,636
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(511)	(351)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	466,766	478,083
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(88,998)	(109,553)
Debt Securities, Available-for-Sale, Unrealized Loss Position	538,591	497,719
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(89,509)	(109,904)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,273	3,111
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4	33
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,217	2,288
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	175	306
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	3,490	5,399
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	179	339
Asset-backed Securities
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	70,967	26,389
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(48)	(189)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	54,351	159,135
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(13,591)	(22,190)
Debt Securities, Available-for-Sale, Unrealized Loss Position	125,318	185,524
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(13,639)	(22,379)
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	7,321	9,988
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(54)	(12)
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	76,141	115,452
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(7,135)	(6,296)
Debt Securities, Available-for-Sale, Unrealized Loss Position	83,462	125,440
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(7,189)	(6,308)
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	16,549	28,818
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	201	2,432
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	16,549	28,818
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	$ 201	$ 2,432

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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.

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