Investments (Credit Losses Related to Debt Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	$ 1,137	$ 424	$ 555	$ 427
No allowance for credit losses has been previously recognized			740
An allowance for credit losses was recorded in a previous period	470		470
Securities sold during the period	(5)	(5)	(163)	(8)
Allowance for credit loss ending balance	1,602	419	1,602	419
Corporate Debt
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	740		0
No allowance for credit losses has been previously recognized			740
An allowance for credit losses was recorded in a previous period	470		470
Securities sold during the period	0		0
Allowance for credit loss ending balance	1,210		1,210
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	207	227	211	229
No allowance for credit losses has been previously recognized			0
An allowance for credit losses was recorded in a previous period	0		0
Securities sold during the period	(4)	(4)	(8)	(6)
Allowance for credit loss ending balance	203	223	203	223
Other commercial mortgage-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance			151
No allowance for credit losses has been previously recognized			0
An allowance for credit losses was recorded in a previous period			0
Securities sold during the period			(151)
Allowance for credit loss ending balance	0		0
Other asset-backed securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss beginning balance	190	197	193	198
No allowance for credit losses has been previously recognized			0
An allowance for credit losses was recorded in a previous period	0		0
Securities sold during the period	(1)	(1)	(4)	(2)
Allowance for credit loss ending balance	$ 189	$ 196	$ 189	$ 196