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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Jun. 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 $ 148,087 $ 461,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,642 7,105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,112,018 1,179,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 138,294 157,295
Debt Securities, Available-for-sale, Unrealized Loss Position 1,260,105 1,640,692
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 139,936 164,400
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 8,521 21,044
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 25 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 220,414 234,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9,767 14,226
Debt Securities, Available-for-sale, Unrealized Loss Position 228,935 255,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 9,792 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 9,484 3,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 210 143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 402,776 403,767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 83,272 83,568
Debt Securities, Available-for-sale, Unrealized Loss Position 412,260 406,884
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 83,482 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 90,236 423,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,345 6,763
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 439,829 478,790
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 44,114 57,410
Debt Securities, Available-for-sale, Unrealized Loss Position 530,065 902,390
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 45,459 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 1,960 1,956
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 39 44
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 6,534 8,342
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 216 408
Debt Securities, Available-for-sale, Unrealized Loss Position 8,494 10,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 255 452
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 37,886 11,708
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 23 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 42,465 54,177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 925 1,683
Debt Securities, Available-for-sale, Unrealized Loss Position 80,351 65,885
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 948 $ 1,706