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Mortgage Loans on Real Estate (Schedule of Impaired Financing Receivables) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Mortgage loans with an allowance, recorded investment $ 1,018   $ 1,024
Mortgage loans with no related allowance, recorded investment 0   0
Impaired mortgage loans, recorded investment 1,018   1,024
Mortgage loans with an allowance, unpaid principal balance 1,247   1,253
Mortgage loans with no related allowance, unpaid principal balance 0   0
Impaired mortgage loans, unpaid principal balance 1,247   1,253
Mortgage loans with an allowance, related allowance (229)   $ (229)
Mortgage loans with an allowance, average recorded investment 1,021 $ 2,509  
Mortgage loans with no related allowance, average recorded investment 0 1,415  
Impaired mortgage loans, average recorded investment 1,021 3,924  
Mortgage loans with an allowance, interest income recognized 17 50  
Mortgage loans with no related allowance, interest income recognized 0 21  
Impaired mortgage loans, interest income reoognized $ 17 $ 71