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Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 461,425 $ 127,160
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7,105 714
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,179,267 1,326,392
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 157,295 151,750
Debt Securities, Available-for-sale, Unrealized Loss Position 1,640,692 1,453,552
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 164,400 152,464
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 21,044 25,886
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 132 85
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 234,191 247,027
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 14,226 20,283
Debt Securities, Available-for-sale, Unrealized Loss Position 255,235 272,913
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 14,358 20,368
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 3,117 1,168
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 143 163
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 403,767 428,171
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 83,568 68,604
Debt Securities, Available-for-sale, Unrealized Loss Position 406,884 429,339
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 83,711 68,767
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 423,600 58,249
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 6,763 417
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 478,790 540,032
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 57,410 58,666
Debt Securities, Available-for-sale, Unrealized Loss Position 902,390 598,281
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 64,173 59,083
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 11,708 41,857
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 23 49
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 54,177 103,588
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,683 3,021
Debt Securities, Available-for-sale, Unrealized Loss Position 65,885 145,445
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 1,706 3,070
Corporate Debt Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,956 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 44 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 8,342 7,574
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 408 1,176
Debt Securities, Available-for-sale, Unrealized Loss Position 10,298 7,574
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 452 $ 1,176