Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	$ 6,446	$ 4,314	$ 5,951	$ 4,552
Addition to (release of) allowance for expected losses	3,478	(910)	3,973	(1,148)
Total ending balance	9,924	3,404	9,924	3,404
Commercial mortgage loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	6,324	4,309	5,847	4,546
Addition to (release of) allowance for expected losses	3,380	(929)	3,857	(1,166)
Total ending balance	9,704	3,380	9,704	3,380
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of year	122	5	104	6
Addition to (release of) allowance for expected losses	98	19	116	18
Total ending balance	$ 220	$ 24	$ 220	$ 24