Investments - Credit Losses Related to Debt Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	$ 555	$ 427
No allowance for credit losses has been previously recognized	2,544	151
An allowance for credit losses was recorded in a previous period	470
Securities sold during the period	(170)	(23)
Allowance for credit loss ending balance	3,399	555
Corporate Debt
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	0
No allowance for credit losses has been previously recognized	2,138
An allowance for credit losses was recorded in a previous period	470
Securities sold during the period	0
Allowance for credit loss ending balance	2,608	0
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	211	229
No allowance for credit losses has been previously recognized	0	0
An allowance for credit losses was recorded in a previous period	0
Securities sold during the period	(14)	(18)
Allowance for credit loss ending balance	197	211
Other commercial mortgage-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	151	0
No allowance for credit losses has been previously recognized	406	151
An allowance for credit losses was recorded in a previous period	0
Securities sold during the period	(151)	0
Allowance for credit loss ending balance	406	151
Other asset-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	193	198
No allowance for credit losses has been previously recognized	0	0
An allowance for credit losses was recorded in a previous period	0
Securities sold during the period	(5)	(5)
Allowance for credit loss ending balance	$ 188	$ 193