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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | $ 165,910 | $ 620,715
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 682 | 11,525
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 1,758,081 | 1,911,161
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 262,860 | 320,809
Debt Securities, Available-for-Sale, Unrealized Loss Position | 1,923,991 | 2,531,876
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (263,542) | (332,334)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 478 | 3,111
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (33)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 58,949 | 63,315
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (5,763) | (7,980)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 59,427 | 66,426
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (5,764) | (8,013)
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 | 94 | 90
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5 | 9
Debt Securities, Available-for-Sale, Unrealized Loss Position | 94 | 90
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (5) | (9)
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 | 66,433 | 71,678
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 6,771 | 11,546
Debt Securities, Available-for-Sale, Unrealized Loss Position | 66,433 | 71,678
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (6,771) | (11,546)
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 | 91,271 | 417,516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 532 | 9,130
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 586,441 | 503,321
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 74,093 | 95,078
Debt Securities, Available-for-Sale, Unrealized Loss Position | 677,712 | 920,837
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (74,625) | (104,208)
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 | 26,320 | 26,516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 92 | 67
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 185,677 | 286,589
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 19,365 | 25,314
Debt Securities, Available-for-Sale, Unrealized Loss Position | 211,997 | 313,105
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (19,457) | (25,381)
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 | 24,507 | 25,990
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (3,669) | (4,454)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 24,507 | 25,990
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (3,669) | (4,454)
Collateralized Mortgage Backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 7,218 | 120,670
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 15 | 1,776
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 292,317 | 296,813
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 38,714 | 50,823
Debt Securities, Available-for-Sale, Unrealized Loss Position | 299,535 | 417,483
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (38,729) | (52,599)
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 | 5,819 | 6,219
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (530) | (788)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 5,819 | 6,219
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (530) | (788)
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 | 11,297 | 19,636
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 19 | 351
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 459,190 | 478,083
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 102,613 | 109,553
Debt Securities, Available-for-Sale, Unrealized Loss Position | 470,487 | 497,719
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (102,632) | (109,904)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 478 | 3,111
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (1) | (33)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 1,250 | 2,288
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (187) | (306)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 1,728 | 5,399
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | (188) | (339)
Asset-backed Securities [Member] |  |
Investments, Unrealized Loss Position [Line Items] |  |
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months | 26,305 | 26,389
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23 | 189
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 66,899 | 159,135
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 14,059 | 22,190
Debt Securities, Available-for-Sale, Unrealized Loss Position | 93,204 | 185,524
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (14,082) | (22,379)
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 | 3,499 | 9,988
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 1 | 12
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer | 101,030 | 115,452
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 7,240 | 6,296
Debt Securities, Available-for-Sale, Unrealized Loss Position | 104,529 | 125,440
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (7,241) | (6,308)
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 | 27,373 | 28,818
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (1,377) | (2,432)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value | 27,373 | 28,818
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss | $ (1,377) | $ (2,432)

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