Investments (Commercial Mortgage and Other Loans) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 436,075	$ 420,305
Commercial mortgage loans, Percentage	100.00%	100.00%
Valuation allowance	$ (643)	$ (482)
Total net commercial mortgage and agricultural property loans by property type	435,432	419,823
Total net other loans	2,740	2,740
Total commercial mortgage and other loans	438,172	422,563
Apartments/Multi-Family
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 136,190	$ 143,057
Commercial mortgage loans, Percentage	31.20%	34.00%
Industrial
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 58,621	$ 87,088
Commercial mortgage loans, Percentage	13.50%	20.70%
Retail
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 67,358	$ 72,226
Commercial mortgage loans, Percentage	15.50%	17.20%
Office
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 100,357	$ 44,621
Commercial mortgage loans, Percentage	23.00%	10.60%
Other
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 18,660	$ 14,119
Commercial mortgage loans, Percentage	4.30%	3.40%
Hospitality
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 4,963	$ 5,081
Commercial mortgage loans, Percentage	1.10%	1.20%
Total commercial mortgage loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 386,149	$ 366,192
Commercial mortgage loans, Percentage	88.60%	87.10%
Agricultural property loans
Servicing Assets at Fair Value [Line Items]
Commercial mortgage loans	$ 49,926	$ 54,113
Commercial mortgage loans, Percentage	11.40%	12.90%
Valuation allowance	$ 0	$ 0
Uncollateralized loans
Servicing Assets at Fair Value [Line Items]
Uncollateralized loans	$ 2,740	$ 2,740

Commercial mortgage loans, Percentage

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- Definition

Loans Receivable, Net, Commercial, Mortgage

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- Definition

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.

+ References

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-Name Staff Accounting Bulletin (SAB)
-Number Topic 6
-Section L
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Amount before allowance of other loans and leases not otherwise specified in the taxonomy. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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