Investments - Maturity Table (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,042,473	$ 2,563,984
Estimated Fair Value	1,933,226	$ 2,411,622
2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	299,816
Estimated Fair Value	298,648
2026
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	549,175
Estimated Fair Value	520,793
2027
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	99,018
Estimated Fair Value	96,303
2038
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	66
Estimated Fair Value	66
2039
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	551
Estimated Fair Value	531
2042
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,112
Estimated Fair Value	1,793
2043
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,761
Estimated Fair Value	3,299
2044
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,085
Estimated Fair Value	3,651
2045
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,518
Estimated Fair Value	3,919
2046
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,953
Estimated Fair Value	5,965
2047
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,704
Estimated Fair Value	5,781
2048
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,702
Estimated Fair Value	1,481
2049
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,838
Estimated Fair Value	12,842
2050
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	101,145
Estimated Fair Value	78,475
2051
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144,694
Estimated Fair Value	111,058
2052
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	58,268
Estimated Fair Value	50,497
2053
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	297,695
Estimated Fair Value	294,197
2054
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	142,209
Estimated Fair Value	135,800
2055
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	71,611
Estimated Fair Value	70,409
2056
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	194,173
Estimated Fair Value	197,363
2058
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,379
Estimated Fair Value	$ 40,355