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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 111,517 $ 461,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,107 7,105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,089,883 1,179,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 115,713 157,295
Debt Securities, Available-for-sale, Unrealized Loss Position 1,201,400 1,640,692
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 116,820 164,400
Obligations of U.S. Government-sponsored enterprises    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 5,993 21,044
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 8 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 219,987 234,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 7,690 14,226
Debt Securities, Available-for-sale, Unrealized Loss Position 225,980 255,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 7,698 14,358
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 6,614 3,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 244 143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 416,996 403,767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 67,418 83,568
Debt Securities, Available-for-sale, Unrealized Loss Position 423,610 406,884
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 67,662 83,711
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 96,890 423,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 854 6,763
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 406,132 478,790
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 39,719 57,410
Debt Securities, Available-for-sale, Unrealized Loss Position 503,022 902,390
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 40,573 64,173
U.S. Treasury bills    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 0 1,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 44
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 6,580 8,342
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 170 408
Debt Securities, Available-for-sale, Unrealized Loss Position 6,580 10,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 170 452
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,020 11,708
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 40,188 54,177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 716 1,683
Debt Securities, Available-for-sale, Unrealized Loss Position 42,208 65,885
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 717 $ 1,706