v3.26.1
Investments - Schedule of Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 960,212 $ 318,264
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 10,823 1,482
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 925,002 996,720
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 112,264 98,641
Debt Securities, Available-for-sale, Unrealized Loss Position 1,885,214 1,314,984
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 123,087 100,123
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 44,031 13,971
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 501 22
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 110,557 149,230
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,758 5,069
Debt Securities, Available-for-sale, Unrealized Loss Position 154,588 163,201
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 5,259 5,091
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 63,987 32,658
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,146 245
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 413,355 425,879
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 69,701 57,864
Debt Securities, Available-for-sale, Unrealized Loss Position 477,342 458,537
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 70,847 58,109
Agency mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 764,440 266,639
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9,086 1,215
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 362,330 377,787
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 37,136 35,115
Debt Securities, Available-for-sale, Unrealized Loss Position 1,126,770 644,426
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 46,222 36,330
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 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3,406 3,406
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 94 94
Debt Securities, Available-for-sale, Unrealized Loss Position 3,406 3,406
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 94 94
Corporate debt securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 87,754 4,996
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 90 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 35,354 40,418
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 575 499
Debt Securities, Available-for-sale, Unrealized Loss Position 123,108 45,414
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 665 $ 499