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Mortgage Loans on Real Estate (Impaired Financing Receivables) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |  |
Mortgage loans with an allowance, recorded investment | $ 1,024 | $ 4,027 |
Mortgage loans with no related allowance, recorded investment | 0 | 1,436 |
Impaired mortgage loans, recorded investment | 1,024 | 5,463 |
Mortgage loans with an allowance, unpaid principal balance | 1,253 | 5,445 |
Mortgage loans with no related allowance, unpaid principal balance | 0 | 1,436 |
Impaired mortgage loans, unpaid principal balance | 1,253 | 6,881 |
Mortgage loans with an allowance, related allowance | (229) | (1,418) |
Mortgage loans with an allowance, average recorded investment | 1,042 | 4,464 | $ 3,398
Mortgage loans with no related allowance, average recorded investment | 0 | 1,513 | 1,665
Impaired mortgage loans, average recorded investment | 1,042 | 5,977 | 5,063
Mortgage loans with an allowance, interest income recognized | 74 | 221 | 301
Mortgage loans with no related allowance, interest income recognized | 0 | 91 | 73
Impaired mortgage loans, interest income recognized | $ 74 | $ 312 | $ 374

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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