Investments (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	$ 165	$ 151
Cumulative effect of adoption of ASU 2016-13	204
Addition to (release of) allowance for credit losses		14
Addition to (release of) allowance for expected losses	88
Total ending balance	457	165
Commercial Mortgage Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	164	150
Cumulative effect of adoption of ASU 2016-13	204
Addition to (release of) allowance for credit losses		14
Addition to (release of) allowance for expected losses	89
Total ending balance	457	164
Agricultural Property Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	1	1
Cumulative effect of adoption of ASU 2016-13	0
Addition to (release of) allowance for credit losses		0
Addition to (release of) allowance for expected losses	(1)
Total ending balance	$ 0	$ 1