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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 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 | $ 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)

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