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Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 4,983,354 | $ 4,413,171
Loans Receivable, Gross, Commercial, Construction | $ 32,620 | $ 9,686
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 | $ 4,561,177 | $ 4,182,753
1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 233,260 | 151,281
Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 156,297 | 69,451
0% - 59.99% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 2,523,670 | 2,206,208
Loans Receivable, Gross, Commercial, Construction | $ 13,691 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 50.60% | 50.00%
0% - 59.99% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 2,410,556 | $ 2,148,428
0% - 59.99% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 61,246 | 53,979
0% - 59.99% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 38,177 | 3,801
60% - 69.99% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 1,749,331 | 1,608,078
Loans Receivable, Gross, Commercial, Construction | $ 18,929 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 35.10% | 36.40%
60% - 69.99% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 1,618,374 | $ 1,517,029
60% - 69.99% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 73,908 | 47,128
60% - 69.99% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 38,120 | 43,921
70% - 79.99% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 517,147 | 431,274
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 0
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 10.40% | 9.80%
70% - 79.99% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 414,269 | $ 396,446
70% - 79.99% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 48,438 | 19,461
70% - 79.99% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 54,440 | 15,367
Greater than 80% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 193,206 | 167,611
Loans Receivable, Gross, Commercial, Construction | $ 0 | $ 9,686
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total | 3.90% | 3.80%
Greater than 80% | Greater than 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 117,978 | $ 120,850
Greater than 80% | 1.00x - 1.20x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | 49,668 | 30,713
Greater than 80% | Less than 1.00x |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans Receivable, Gross, Commercial, Real Estate | $ 25,560 | $ 6,362

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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 construction loans. 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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