Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 1,077,359	$ 436,075
Valuation allowance	(1,582)	(643)
Total net commercial mortgage and agricultural property loans by property type	1,075,777	435,432
Valuation allowance	0	0
Total net other loans	0	2,740
Total commercial mortgage and other loans	$ 1,075,777	$ 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:	$ 994,254	$ 386,149
% of Total	92.30%	88.60%
Uncollateralized loans
Servicing Assets at Fair Value [Line Items]
Other Loans	$ 0	$ 2,740
Apartments/Multi-Family
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 278,142	$ 136,190
% of Total	25.90%	31.20%
Industrial
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 192,151	$ 58,621
% of Total	17.80%	13.50%
Retail
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 207,103	$ 67,358
% of Total	19.20%	15.50%
Office
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 244,861	$ 100,357
% of Total	22.70%	23.00%
Other
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 50,428	$ 18,660
% of Total	4.70%	4.30%
Hospitality
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 21,569	$ 4,963
% of Total	2.00%	1.10%
Agricultural property loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage and agricultural property loans by property type:	$ 83,105	$ 49,926
% of Total	7.70%	11.40%
NEW YORK
Servicing Assets at Fair Value [Line Items]
% of Total	10.00%
TEXAS
Servicing Assets at Fair Value [Line Items]
% of Total	9.00%
CALIFORNIA
Servicing Assets at Fair Value [Line Items]
% of Total	28.00%

Commercial Mortgage Loan,Concentration Percentage

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Loans Receivable, Net, Commercial, Mortgage

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Total Commercial Mortgage And Other Loans

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Total Net Other Loans

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The allowance for commercial loan and lease losses represents the reserve to cover probable credit losses related to specifically identified commercial loans and leases, as well as probable credit losses inherent in the remainder of the commercial loan portfolio as of the balance sheet date. For banks, include currently required allocated transfer risk reserves. Include carryover of or adjustments to the allowance for commercial loan losses in connection with business combinations determined to be appropriate.

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