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Fair Value of Financial Instruments (Carrying Value of Commercial Mortgage Loans and Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items] |  |
Total amortized cost | $ 34,271 | $ 25,828
Allowance allowance | (62) | (46)
Carrying Value | 34,209 | 25,782
Total mortgage loans | Mortgage Loans by Region |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 34,271 | $ 25,828
Percent of Total | 100.00% | 100.00%
Total mortgage loans | Mortgage Loans by Region | East North Central |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,245 | $ 3,244
Percent of Total | 9.50% | 12.60%
Total mortgage loans | Mortgage Loans by Region | Southern Atlantic |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 6,652 | $ 6,652
Percent of Total | 19.40% | 25.80%
Total mortgage loans | Mortgage Loans by Region | East South Central |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 4,937 | $ 4,975
Percent of Total | 14.40% | 19.30%
Total mortgage loans | Mortgage Loans by Region | New England |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 6,588 | $ 6,588
Percent of Total | 19.20% | 25.40%
Total mortgage loans | Mortgage Loans by Region | Middle Atlantic |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 12,849 | $ 4,369
Percent of Total | 37.50% | 16.90%
Total mortgage loans | Property Type Concentration Risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 34,271 | $ 25,828
Percent of Total | 100.00% | 100.00%
Total mortgage loans | Property Type Concentration Risk | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 3,245 | $ 3,244
Percent of Total | 9.50% | 12.60%
Total mortgage loans | Property Type Concentration Risk | Office |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 11,589 | $ 11,627
Percent of Total | 33.80% | 45.00%
Total mortgage loans | Property Type Concentration Risk | Mixed use/Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying Value | $ 19,437 | $ 10,957
Percent of Total | 56.70% | 42.40%
Less than 65% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total amortized cost | $ 25,775 | $ 25,828
65% to 75% |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total amortized cost | $ 8,496 | $ 0

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82921503&loc=d3e21338-158488 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + 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)(3)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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