Investments - Maturity Table (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,775,289	$ 1,812,408
Estimated Fair Value	1,716,712	$ 1,758,070
2026
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	349,905
Estimated Fair Value	347,731
2027
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	99,626
Estimated Fair Value	98,685
2038
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	61
Estimated Fair Value	61
2039
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	491
Estimated Fair Value	482
2042
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,598
Estimated Fair Value	1,397
2043
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,112
Estimated Fair Value	2,804
2044
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,364
Estimated Fair Value	3,072
2045
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,098
Estimated Fair Value	3,661
2046
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,214
Estimated Fair Value	5,475
2047
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,716
Estimated Fair Value	5,104
2048
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,634
Estimated Fair Value	1,532
2049
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,673
Estimated Fair Value	11,270
2050
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	91,084
Estimated Fair Value	73,038
2051
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	128,469
Estimated Fair Value	101,505
2052
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	47,647
Estimated Fair Value	42,118
2053
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	254,273
Estimated Fair Value	254,067
2054
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	223,676
Estimated Fair Value	220,255
2055
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	223,206
Estimated Fair Value	222,778
2056
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	289,349
Estimated Fair Value	291,837
2058
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,093
Estimated Fair Value	$ 29,840