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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 334,072 | $ 80,976
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 3,289 | 1,194
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 2,259,964 | 2,739,797
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 372,015 | 364,126
Debt Securities, Available-for-Sale, Unrealized Loss Position | 2,594,036 | 2,820,773
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (375,304) | (365,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,368 | 1,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (75) | (3)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 64,666 | 65,086
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (8,815) | (8,760)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 68,034 | 66,214
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (8,890) | (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 | 30,972 | 31,243
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 3,943 | 3,661
Debt Securities, Available-for-Sale, Unrealized Loss Position | 30,972 | 31,243
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (3,943) | (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 | 69,980 | 69,780
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 12,521 | 12,010
Debt Securities, Available-for-Sale, Unrealized Loss Position | 69,980 | 69,780
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (12,521) | (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 | 170,664 | 31,892
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,559 | 483
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 548,735 | 538,863
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 100,255 | 85,049
Debt Securities, Available-for-Sale, Unrealized Loss Position | 719,399 | 570,755
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (102,814) | (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 | 26,663 | 1,772
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 103 | 11
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 358,441 | 495,451
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 33,362 | 35,900
Debt Securities, Available-for-Sale, Unrealized Loss Position | 385,104 | 497,223
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (33,465) | (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 | 27,070 | 28,298
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4,891) | (4,628)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 27,070 | 28,298
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (4,891) | (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 | 54,817 | 10,699
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 167 | 157
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 313,966 | 393,884
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 57,058 | 60,120
Debt Securities, Available-for-Sale, Unrealized Loss Position | 368,783 | 404,583
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (57,225) | (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 | 6,593 | 7,431
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (873) | (539)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 6,593 | 7,431
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (873) | (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 | 29,951 | 15,155
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 361 | 132
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 505,236 | 562,740
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 123,987 | 114,188
Debt Securities, Available-for-Sale, Unrealized Loss Position | 535,187 | 577,895
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (124,348) | (114,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,368 | 1,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (75) | (3)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 2,554 | 1,488
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (250) | (212)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 5,922 | 2,616
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (325) | (215)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 51,977 | 6,853
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 99 | 15
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 314,378 | 542,029
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 29,922 | 39,798
Debt Securities, Available-for-Sale, Unrealized Loss Position | 366,355 | 548,882
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (30,021) | (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 | 118,256 | 105,807
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 10,967 | 13,400
Debt Securities, Available-for-Sale, Unrealized Loss Position | 118,256 | 120,412
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (10,967) | (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 | 28,449 | 27,869
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (2,801) | (3,381)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 28,449 | 27,869
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | $ (2,801) | $ (3,381)

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