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Schedule of Participating Mortgage Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Net Investment Income [Line Items]    
Total $ 715,702 $ 668,032
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Net Investment Income [Line Items]    
Total 697,484 639,875
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]    
Net Investment Income [Line Items]    
Total $ 18,218 $ 28,157