Investments - Maturity Table (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,747,064	$ 2,042,473
Estimated Fair Value	1,656,977	$ 1,933,226
2026
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	549,295
Estimated Fair Value	526,987
2027
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	99,118
Estimated Fair Value	97,369
2038
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	65
Estimated Fair Value	66
2039
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	541
Estimated Fair Value	530
2042
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,071
Estimated Fair Value	1,784
2043
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,709
Estimated Fair Value	3,326
2044
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,044
Estimated Fair Value	3,683
2045
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,465
Estimated Fair Value	3,955
2046
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,894
Estimated Fair Value	6,047
2047
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,481
Estimated Fair Value	5,695
2048
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,682
Estimated Fair Value	1,501
2049
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,580
Estimated Fair Value	12,869
2050
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	99,980
Estimated Fair Value	79,163
2051
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	142,312
Estimated Fair Value	111,537
2052
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	56,137
Estimated Fair Value	49,462
2053
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	288,001
Estimated Fair Value	286,533
2054
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	136,475
Estimated Fair Value	131,665
2055
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	105,981
Estimated Fair Value	105,006
2056
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	187,742
Estimated Fair Value	191,280
2058
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	37,491
Estimated Fair Value	$ 38,519