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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 318,264 $ 461,425
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,482 7,105
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 996,720 1,179,267
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 98,641 157,295
Debt Securities, Available-for-sale, Unrealized Loss Position 1,314,984 1,640,692
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 100,123 164,400
US Government-sponsored Enterprises Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 13,971 21,044
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 22 132
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 149,230 234,191
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 5,069 14,226
Debt Securities, Available-for-sale, Unrealized Loss Position 163,201 255,235
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 5,091 14,358
US States and Political Subdivisions Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 32,658 3,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 245 143
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 425,879 403,767
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 57,864 83,568
Debt Securities, Available-for-sale, Unrealized Loss Position 458,537 406,884
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 58,109 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 266,639 423,600
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,215 6,763
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 377,787 478,790
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 35,115 57,410
Debt Securities, Available-for-sale, Unrealized Loss Position 644,426 902,390
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 36,330 64,173
US Treasury Bill Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 4,996 11,708
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 23
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 40,418 54,177
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 499 1,683
Debt Securities, Available-for-sale, Unrealized Loss Position 45,414 65,885
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 499 1,706
Corporate Debt Securities [Member]    
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 3,406 8,342
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 94 408
Debt Securities, Available-for-sale, Unrealized Loss Position 3,406 10,298
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 94 $ 452