INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 176,531	$ 80,976
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,218	1,194
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,410,422	2,739,797
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	371,629	364,126
Debt Securities, Available-for-Sale, Unrealized Loss Position	2,586,953	2,820,773
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(372,847)	(365,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,912	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	65,420	65,086
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(8,730)	(8,760)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	68,332	66,214
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(8,763)	(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	30,912	31,243
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	3,998	3,661
Debt Securities, Available-for-Sale, Unrealized Loss Position	30,912	31,243
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(3,998)	(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	69,384	69,780
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12,761	12,010
Debt Securities, Available-for-Sale, Unrealized Loss Position	69,384	69,780
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(12,761)	(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
Residential Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	87,732	31,892
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	787	483
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	566,393	538,863
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	97,552	85,049
Debt Securities, Available-for-Sale, Unrealized Loss Position	654,125	570,755
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(98,339)	(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
Commercial Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	0	1,772
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	11
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	373,651	495,451
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	35,560	35,900
Debt Securities, Available-for-Sale, Unrealized Loss Position	373,651	497,223
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(35,560)	(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	27,547	28,298
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,739)	(4,628)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	27,547	28,298
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(4,739)	(4,628)
Collateralized Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	10,141	10,699
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	18	157
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	325,367	393,884
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	58,093	60,120
Debt Securities, Available-for-Sale, Unrealized Loss Position	335,508	404,583
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(58,111)	(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	7,135	7,431
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(662)	(539)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	7,135	7,431
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(662)	(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	31,689	15,155
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	209	132
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	510,000	562,740
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	119,008	114,188
Debt Securities, Available-for-Sale, Unrealized Loss Position	541,689	577,895
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(119,217)	(114,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	2,912	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	2,580	1,488
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(237)	(212)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	5,492	2,616
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(270)	(215)
Asset-backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	46,969	6,853
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	204	15
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	417,895	542,029
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	32,266	39,798
Debt Securities, Available-for-Sale, Unrealized Loss Position	464,864	548,882
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(32,470)	(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	0	14,605
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	396
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	116,820	105,807
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	12,391	13,400
Debt Securities, Available-for-Sale, Unrealized Loss Position	116,820	120,412
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(12,391)	(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	28,158	27,869
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,092)	(3,381)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	28,158	27,869
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	$ (3,092)	$ (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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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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