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INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 127,028 $ 80,976
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,051 1,194
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,063,861 2,739,797
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 274,543 364,126
Debt Securities, Available-for-Sale, Unrealized Loss Position 2,190,889 2,820,773
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (275,594) (365,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1,025 1,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6) (3)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 64,375 65,086
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (6,963) (8,760)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 65,400 66,214
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (6,969) (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 93 31,243
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7 3,661
Debt Securities, Available-for-Sale, Unrealized Loss Position 93 31,243
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (7) (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 73,909 69,780
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 8,952 12,010
Debt Securities, Available-for-Sale, Unrealized Loss Position 73,909 69,780
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (8,952) (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 32,903 31,892
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 63 483
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 538,029 538,863
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 73,399 85,049
Debt Securities, Available-for-Sale, Unrealized Loss Position 570,932 570,755
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (73,462) (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 23,191 1,772
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 554 11
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 324,377 495,451
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 23,072 35,900
Debt Securities, Available-for-Sale, Unrealized Loss Position 347,568 497,223
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (23,626) (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 27,464 28,298
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (3,778) (4,628)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 27,464 28,298
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (3,778) (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 56,534 10,699
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 353 157
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 311,939 393,884
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 44,132 60,120
Debt Securities, Available-for-Sale, Unrealized Loss Position 368,473 404,583
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (44,485) (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 6,692 7,431
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (539) (539)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 6,692 7,431
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (539) (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 0 15,155
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 132
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 496,345 562,740
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 98,608 114,188
Debt Securities, Available-for-Sale, Unrealized Loss Position 496,345 577,895
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (98,608) (114,320)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value 1,025 1,128
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (6) (3)
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value 1,384 1,488
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (231) (212)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 2,409 2,616
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss (237) (215)
Asset-backed Securities [Member]    
Investments, Unrealized Loss Position [Line Items]    
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months 14,400 6,853
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 81 15
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer 204,634 542,029
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 19,172 39,798
Debt Securities, Available-for-Sale, Unrealized Loss Position 219,034 548,882
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (19,253) (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 114,535 105,807
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,201 13,400
Debt Securities, Available-for-Sale, Unrealized Loss Position 114,535 120,412
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax (7,201) (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 28,835 27,869
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (2,415) (3,381)
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value 28,835 27,869
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss $ (2,415) $ (3,381)