INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,105,258	$ 523,533
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	185,909	2,200
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,256,413	1,587,302
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	277,934	227,996
Debt Securities, Available-for-Sale, Unrealized Loss Position	4,361,671	2,110,835
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(463,843)	(230,196)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	4,113	2,273
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(92)	(4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	27,059	47,336
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(5,329)	(4,267)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	31,172	49,609
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(5,421)	(4,271)
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	95
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	5	4
Debt Securities, Available-for-Sale, Unrealized Loss Position	95	95
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(5)	(4)
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	80,609	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,231	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Debt Securities, Available-for-Sale, Unrealized Loss Position	80,609	0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(5,231)	0
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
Residential Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	1,408,559	277,394
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	112,009	1,349
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	377,631	536,694
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	87,365	68,418
Debt Securities, Available-for-Sale, Unrealized Loss Position	1,786,190	814,088
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(199,374)	(69,767)
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
Commercial Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	234,818	39,084
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	14,799	108
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	129,252	166,649
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	15,993	13,633
Debt Securities, Available-for-Sale, Unrealized Loss Position	364,070	205,733
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(30,792)	(13,741)
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	21,336	23,981
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,396)	(3,392)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	21,336	23,981
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(4,396)	(3,392)
Collateralized Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	748,886	56,942
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	32,854	130
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	240,608	286,606
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	45,957	36,217
Debt Securities, Available-for-Sale, Unrealized Loss Position	989,494	343,548
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(78,811)	(36,347)
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	4,692	5,589
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(710)	(499)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	4,692	5,589
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(710)	(499)
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	208,210	71,825
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16,964	511
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	413,019	466,766
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	116,664	88,998
Debt Securities, Available-for-Sale, Unrealized Loss Position	621,229	538,591
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(133,628)	(89,509)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	4,113	2,273
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(92)	(4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,031	1,217
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(223)	(175)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	5,144	3,490
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(315)	(179)
Asset-backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	320,447	70,967
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,331	48
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	41,773	54,351
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	9,963	13,591
Debt Securities, Available-for-Sale, Unrealized Loss Position	362,220	125,318
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(12,294)	(13,639)
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	103,729	7,321
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,721	54
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	54,035	76,141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,987	7,135
Debt Securities, Available-for-Sale, Unrealized Loss Position	157,764	83,462
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(3,708)	(7,189)
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	16,549
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(201)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	0	16,549
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	$ 0	$ (201)

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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