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Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Total $ 687,860 $ 668,032
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Total 662,995 639,875
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Total $ 24,865 $ 28,157