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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,333,997 | $ 3,783,207
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 100.00% | 100.00%
LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,116,137 | $ 1,925,755
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 48.80% | 50.80%
LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,646,440 | $ 1,292,466
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 38.00% | 34.20%
LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 476,709 | $ 415,330
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 11.00% | 11.00%
LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 94,711 | $ 149,656
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 2.20% | 4.00%
Debt Service Coverage Ratio Range One [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,051,289 | $ 3,601,817
Debt Service Coverage Ratio Range One [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,060,277 | 1,859,640
Debt Service Coverage Ratio Range One [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,515,469 | 1,257,788
Debt Service Coverage Ratio Range One [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 424,195 | 370,092
Debt Service Coverage Ratio Range One [Member] | LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 51,348 | 114,297
Debt Service Coverage Ratio Range Two [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 190,390 | 120,296
Debt Service Coverage Ratio Range Two [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 51,162 | 64,749
Debt Service Coverage Ratio Range Two [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 86,613 | 34,678
Debt Service Coverage Ratio Range Two [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 32,664 | 20,869
Debt Service Coverage Ratio Range Two [Member] | LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 19,951 | 0
Debt Service Coverage Ratio Range Three [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 92,318 | 61,094
Debt Service Coverage Ratio Range Three [Member] | LTV 0 to 59 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 4,698 | 1,366
Debt Service Coverage Ratio Range Three [Member] | LTV 60 To 69 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 44,358 | 0
Debt Service Coverage Ratio Range Three [Member] | LTV 70 To 79 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 19,850 | 24,369
Debt Service Coverage Ratio Range Three [Member] | LTV 80 to 100 Percent [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 23,412 | $ 35,359

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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=84173941&loc=d3e5066-111524 + Details
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