Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 9,924	$ 3,404	$ 5,951	$ 4,552
Addition to (release of) allowance for expected losses	6,208	850	10,181	(298)
Total ending balance	16,132	4,254	16,132	4,254
Commercial mortgage loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	9,704	3,380	5,847	4,546
Addition to (release of) allowance for expected losses	6,116	850	9,973	(316)
Total ending balance	15,820	4,230	15,820	4,230
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	220	24	104	6
Addition to (release of) allowance for expected losses	92	0	208	18
Total ending balance	$ 312	$ 24	$ 312	$ 24