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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 427,069	$ 1,502,821
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	16,887	89,206
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,727,041	1,785,690
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	395,510	329,398
Debt Securities, Available-for-Sale, Unrealized Loss Position	3,154,110	3,288,511
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(412,397)	(418,604)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,926	36,214
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(63)	(3,422)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	66,015	37,399
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(9,993)	(4,219)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	69,941	73,613
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(10,056)	(7,641)
U.S. Treasuries
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	2,388	2,383
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	45	46
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	30,459	30,313
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	4,435	4,570
Debt Securities, Available-for-Sale, Unrealized Loss Position	32,847	32,696
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(4,480)	(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	67,867	66,468
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	13,213	13,914
Debt Securities, Available-for-Sale, Unrealized Loss Position	67,867	66,468
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(13,213)	(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
Residential Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	128,696	195,972
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,219	10,413
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	475,280	443,415
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	90,603	87,049
Debt Securities, Available-for-Sale, Unrealized Loss Position	603,976	639,387
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(95,822)	(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
Commercial Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	38,384	440,207
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,170	18,823
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	553,211	175,530
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	46,699	28,551
Debt Securities, Available-for-Sale, Unrealized Loss Position	591,595	615,737
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(47,869)	(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	29,314	13,593
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(4,837)	(1,917)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	29,314	31,249
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(4,837)	(4,114)
Collateralized Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	62,687	199,138
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	3,421	12,453
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	370,635	269,242
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	61,100	48,986
Debt Securities, Available-for-Sale, Unrealized Loss Position	433,322	468,380
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(64,521)	(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	7,871	2,136
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(947)	(221)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	7,871	8,453
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(947)	(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	117,623	295,913
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,769	31,196
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	530,508	368,673
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	115,962	92,972
Debt Securities, Available-for-Sale, Unrealized Loss Position	648,131	664,586
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(120,731)	(124,168)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	3,926	5,160
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(63)	(201)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	1,518	0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(271)	0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	5,444	5,160
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	(334)	(201)
Asset-backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	40,229	250,946
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	826	9,410
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	611,943	422,090
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	52,254	51,565
Debt Securities, Available-for-Sale, Unrealized Loss Position	652,172	673,036
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(53,080)	(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	37,062	118,262
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,437	6,865
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	87,138	9,959
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	11,244	1,791
Debt Securities, Available-for-Sale, Unrealized Loss Position	124,200	128,221
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax	(12,681)	(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	27,312	21,670
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,938)	(2,081)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	27,312	28,751
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss	$ (3,938)	$ (2,499)

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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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