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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Mortgage loans with an allowance, recorded investment | $ 1,006 |  | $ 1,006 |  | $ 1,024
Mortgage loans with no related allowance, recorded investment | 0 |  | 0 |  | 0
Impaired mortgage loans, recorded investment | 1,006 |  | 1,006 |  | 1,024
Mortgage loans with an allowance, unpaid principal balance | 1,235 |  | 1,235 |  | 1,253
Mortgage loans with no related allowance, unpaid principal balance | 0 |  | 0 |  | 0
Impaired mortgage loans, unpaid principal balance | 1,235 |  | 1,235 |  | 1,253
Mortgage loans with an allowance, related allowance | (229) |  | (229) |  | $ (229)
Mortgage loans with an allowance, average recorded investment | 1,009 | $ 2,337 | 1,015 | $ 2,386 |
Mortgage loans with no related allowance, average recorded investment | 0 | 0 | 0 | 0 |
Impaired mortgage loans, average recorded investment | 1,009 | 2,337 | 1,015 | 2,386 |
Mortgage loans with an allowance, interest income recognized | 17 | 37 | 52 | 136 |
Mortgage loans with no related allowance, interest income recognized | 0 | 0 | 0 | 0 |
Impaired mortgage loans, interest income reoognized | $ 17 | $ 37 | $ 52 | $ 136 |

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