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Investments - Schedule of Unrealized Loss on Investments (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
U.S. Government and Agency Securities    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 0 9
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 19,943
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 0 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 0 $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 0 $ 0
States, Municipalities and Political Subdivisions    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 0 1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 7
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 0 $ 507
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 28 29
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 1,597 $ 2,197
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 16,277 $ 16,457
Public Utilities    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 2 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 5 $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 529 $ 0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 6 6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 296 $ 438
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 3,392 $ 3,288
Corporate Securities    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 19 1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 41 $ 6
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 7,149 $ 511
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 81 85
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 5,253 $ 7,207
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 47,129 $ 46,708
Mortgage-backed securities    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 1 1
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 1 $ 5
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 259 $ 269
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 63 69
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 4,708 $ 6,249
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 32,231 $ 34,353
Asset-backed Securities    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 1 2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 0 $ 3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 126 $ 616
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 23 24
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 798 $ 1,203
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 8,462 $ 8,869
Fixed Maturities    
Twelve Months or More    
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | security 23 14
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss $ 47 $ 24
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months $ 8,063 $ 21,846
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions | security 201 213
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 12,652 $ 17,294
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer $ 107,491 $ 109,675