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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 520,010 $ 620,715
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4,667 11,525
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,730,504 1,911,161
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 289,780 320,809
Debt Securities, Available-for-Sale, Unrealized Loss Position 2,250,514 2,531,876
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (294,447) (332,334)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,144 3,111
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (24) (33)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 63,637 63,315
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (7,116) (7,980)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 66,781 66,426
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (7,140) (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 92 90
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7 9
Debt Securities, Available-for-Sale, Unrealized Loss Position 92 90
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (7) (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 64,361 71,678
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 8,212 11,546
Debt Securities, Available-for-Sale, Unrealized Loss Position 64,361 71,678
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (8,212) (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 266,946 417,516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,441 9,130
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 485,197 503,321
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 81,569 95,078
Debt Securities, Available-for-Sale, Unrealized Loss Position 752,143 920,837
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (85,010) (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 23,709 26,516
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 59 67
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 230,179 286,589
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 21,287 25,314
Debt Securities, Available-for-Sale, Unrealized Loss Position 253,888 313,105
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (21,346) (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 26,084 25,990
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (4,017) (4,454)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 26,084 25,990
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (4,017) (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 88,599 120,670
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 589 1,776
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 288,026 296,813
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 44,179 50,823
Debt Securities, Available-for-Sale, Unrealized Loss Position 376,625 417,483
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (44,768) (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 6,189 6,219
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (647) (788)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 6,189 6,219
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (647) (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 11,197 19,636
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 171 351
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 462,642 478,083
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 112,484 109,553
Debt Securities, Available-for-Sale, Unrealized Loss Position 473,839 497,719
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (112,655) (109,904)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 3,144 3,111
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (24) (33)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 2,265 2,288
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (301) (306)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 5,409 5,399
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (325) (339)
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 129,559 26,389
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 407 189
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 85,591 159,135
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14,702 22,190
Debt Securities, Available-for-Sale, Unrealized Loss Position 215,150 185,524
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (15,109) (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 0 9,988
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 12
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 114,416 115,452
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,340 6,296
Debt Securities, Available-for-Sale, Unrealized Loss Position 114,416 125,440
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (7,340) (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 29,099 28,818
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,151) (2,432)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 29,099 28,818
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss $ (2,151) $ (2,432)