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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 loans | Dec. 31, 2017 USD ($) loans
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans | 0 | 2
Principal balance outstanding |  | $ 4,880
Specific loan loss allowance |  | (467)
Net carrying amount |  | $ 4,413
South Atlantic |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans |  | 1
Principal balance outstanding |  | $ 2,947
Specific loan loss allowance |  | 0
Net carrying amount |  | $ 2,947
East |  |
Financing Receivable, Modifications [Line Items] |  |
Number of TDRs | loans |  | 1
Principal balance outstanding |  | $ 1,933
Specific loan loss allowance |  | (467)
Net carrying amount |  | $ 1,466

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- Definition Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings. + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Pre-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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