Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 444,529	$ 436,075
Valuation allowance	(649)	(643)
Total net commercial mortgage and agricultural property loans by property type	443,880	435,432
Valuation allowance	0	0
Total net other loans	2,740	2,740
Total commercial mortgage and other loans	$ 446,620	$ 438,172
% of Total	100.00%	100.00%
Total commercial mortgage loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 395,802	$ 386,149
% of Total	89.00%	88.60%
Uncollateralized loans
Servicing Assets at Fair Value [Line Items]
Other Loans	$ 2,740	$ 2,740
Apartments/Multi-Family
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 139,790	$ 136,190
% of Total	31.50%	31.20%
Industrial
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 63,037	$ 58,621
% of Total	14.20%	13.50%
Retail
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 66,848	$ 67,358
% of Total	15.00%	15.50%
Office
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 99,247	$ 100,357
% of Total	22.30%	23.00%
Other
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 21,947	$ 18,660
% of Total	4.90%	4.30%
Hospitality
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 4,933	$ 4,963
% of Total	1.10%	1.10%
Agricultural property loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 48,727	$ 49,926
% of Total	11.00%	11.40%

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Total Commercial Mortgage And Other Loans

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