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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 3,783,207 | $ 3,136,764
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 3,601,817 | $ 2,953,180
1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 120,296 | 112,947
Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 61,094 | 70,637
0% - 59.99% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,925,755 | $ 1,700,541
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 50.80% | 54.20%
0% - 59.99% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,859,640 | $ 1,621,056
0% - 59.99% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 64,749 | 77,118
0% - 59.99% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,366 | 2,367
60% - 69.99% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,292,466 | $ 915,748
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 34.20% | 29.20%
60% - 69.99% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,257,788 | $ 881,611
60% - 69.99% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 34,678 | 14,332
60% - 69.99% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 19,805
70% - 79.99% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 415,330 | $ 489,051
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 11.00% | 15.60%
70% - 79.99% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 370,092 | $ 446,565
70% - 79.99% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 20,869 | 7,947
70% - 79.99% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 24,369 | 34,539
Greater than 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 149,656 | $ 31,424
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 4.00% | 1.00%
Greater than 80% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 114,297 | $ 3,948
Greater than 80% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 0 | 13,550
Greater than 80% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 35,359 | $ 13,926

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- Definition The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References No definition available. + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5066-111524 + Details
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