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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance $ (29,269) $ (24,024) $ (28,514) $ (31,029)
Mortgage loans, carrying value 5,734,872 5,687,998    
Commercial Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal outstanding 3,610,872 3,633,131    
Deferred fees and costs, net (4,873) (4,629)    
Mortgage loans, amortized cost 3,605,999 3,628,502    
Valuation allowance (24,587) (17,926) (26,139) (25,529)
Mortgage loans, carrying value 3,581,412 3,610,576    
Agricultural Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal outstanding 464,431 408,135    
Deferred fees and costs, net (1,344) (1,136)    
Mortgage loans, amortized cost 463,087 406,999    
Valuation allowance (558) (519) (439) (2,130)
Mortgage loans, carrying value 462,529 406,480    
Residential Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal outstanding 1,669,897 1,652,910    
Deferred fees and costs, net 1,432 1,468    
Unamortized discounts and premiums, net 23,726 22,143    
Mortgage loans, amortized cost 1,695,055 1,676,521    
Valuation allowance (4,124) (5,579) $ (1,936) $ (3,370)
Mortgage loans, carrying value $ 1,690,931 $ 1,670,942