Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 138,371	$ 143,263
Commercial mortgage loans, Percentage	100.00%	100.00%
Allowance for Credit Losses	$ (457)	$ (165)
Total commercial mortgage and other loans	137,914	143,098
Apartments and multi-family
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 47,170	$ 47,568
Commercial mortgage loans, Percentage	34.10%	33.20%
Hospitality
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 14,160	$ 14,266
Commercial mortgage loans, Percentage	10.20%	10.00%
Industrial
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 16,479	$ 18,907
Commercial mortgage loans, Percentage	11.90%	13.20%
Office
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 23,290	$ 24,035
Commercial mortgage loans, Percentage	16.80%	16.70%
Other
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 18,775	$ 18,853
Commercial mortgage loans, Percentage	13.60%	13.20%
Retail
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 16,025	$ 16,174
Commercial mortgage loans, Percentage	11.60%	11.30%
Commercial Mortgage Loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 135,899	$ 139,803
Commercial mortgage loans, Percentage	98.20%	97.60%
Agricultural property loans
Commercial Mortgage and Other Loans [Line Items]
Commercial mortgage and agricultural property loans by property type	$ 2,472	$ 3,460
Commercial mortgage loans, Percentage	1.80%	2.40%