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Mortgage Loans on Real Estate (Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |  |
Mortgage loans with an allowance, recorded investment | $ 1,000 | $ 1,024 |
Mortgage loans with no related allowance, recorded investment | 0 | 0 |
Impaired mortgage loans, recorded investment | 1,000 | 1,024 |
Mortgage loans with an allowance, unpaid principal balance | 1,229 | 1,253 |
Mortgage loans with no related allowance, unpaid principal balance | 0 | 0 |
Impaired mortgage loans, unpaid principal balance | 1,229 | 1,253 |
Mortgage loans with an allowance, related allowance | (229) | (229) |
Mortgage loans with an allowance, average recorded investment | 1,012 | 1,042 | $ 4,464
Mortgage loans with no related allowance, average recorded investment | 0 | 0 | 1,513
Impaired mortgage loans, average recorded investment | 1,012 | 1,042 | 5,977
Mortgage loans with an allowance, interest income recognized | 69 | 74 | 221
Mortgage loans with no related allowance, interest income recognized | 0 | 0 | 91
Impaired mortgage loans, interest income recognized | $ 69 | $ 74 | $ 312

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