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Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Net Investment Income [Line Items]    
Total $ 715,689 $ 715,702
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Net Investment Income [Line Items]    
Total 695,360 697,484
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]    
Net Investment Income [Line Items]    
Total $ 20,329 $ 18,218