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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
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Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 2,388,595 | $ 523,533
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 28,008 | 2,200
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,400,160 | 1,587,302
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 226,073 | 227,996
Debt Securities, Available-for-Sale, Unrealized Loss Position | 3,788,755 | 2,110,835
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (254,081) | (230,196)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,402 | 2,273
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (17) | (4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 38,336 | 47,336
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (4,291) | (4,267)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 41,738 | 49,609
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (4,308) | (4,271)
U.S. Treasuries |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 10,033 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10 | 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 | 10,128 | 95
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (15) | (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 | 35,470 | 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 249 | 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 | 35,470 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (249) | 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 | 1,181,376 | 277,394
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15,690 | 1,349
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 414,361 | 536,694
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 67,267 | 68,418
Debt Securities, Available-for-Sale, Unrealized Loss Position | 1,595,737 | 814,088
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (82,957) | (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 | 189,148 | 39,084
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,506 | 108
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 151,568 | 166,649
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13,733 | 13,633
Debt Securities, Available-for-Sale, Unrealized Loss Position | 340,716 | 205,733
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (16,239) | (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 | 23,459 | 23,981
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,468) | (3,392)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 23,459 | 23,981
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (3,468) | (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 | 600,352 | 56,942
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5,748 | 130
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 263,609 | 286,606
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 35,807 | 36,217
Debt Securities, Available-for-Sale, Unrealized Loss Position | 863,961 | 343,548
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (41,555) | (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 | 5,333 | 5,589
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (513) | (499)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 5,333 | 5,589
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (513) | (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 | 114,099 | 71,825
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,566 | 511
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 453,419 | 466,766
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 92,109 | 88,998
Debt Securities, Available-for-Sale, Unrealized Loss Position | 567,518 | 538,591
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (94,675) | (89,509)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 3,402 | 2,273
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (17) | (4)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,167 | 1,217
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (187) | (175)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 4,569 | 3,490
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (204) | (179)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 230,177 | 70,967
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1,068 | 48
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 47,549 | 54,351
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14,418 | 13,591
Debt Securities, Available-for-Sale, Unrealized Loss Position | 277,726 | 125,318
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (15,486) | (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 | 27,940 | 7,321
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 171 | 54
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 69,559 | 76,141
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 2,734 | 7,135
Debt Securities, Available-for-Sale, Unrealized Loss Position | 97,499 | 83,462
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (2,905) | (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 | 8,377 | 16,549
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (123) | (201)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 8,377 | 16,549
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | $ (123) | $ (201)

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