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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Valuation allowance $ (45,626) $ (36,972) $ (29,269) $ (24,024)
Mortgage loans, carrying value 7,199,225 6,949,027 [1]    
Commercial Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal outstanding 3,570,314 3,560,903    
Deferred fees and costs, net (6,407) (6,345)    
Mortgage loans, amortized cost 3,563,907 3,554,558    
Valuation allowance (25,082) (22,428) (24,587) (17,926)
Mortgage loans, carrying value 3,538,825 3,532,130    
Agricultural Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal outstanding 609,026 567,630    
Deferred fees and costs, net (1,759) (1,667)    
Mortgage loans, amortized cost 607,267 565,963    
Valuation allowance (1,356) (1,021) (558) (519)
Mortgage loans, carrying value 605,911 564,942    
Residential Mortgage Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Principal outstanding 3,011,666 2,807,652    
Deferred fees and costs, net 1,326 1,909    
Unamortized discounts and premiums, net 60,685 55,917    
Mortgage loans, amortized cost 3,073,677 2,865,478    
Valuation allowance (19,188) (13,523) $ (4,124) $ (5,579)
Mortgage loans, carrying value $ 3,054,489 $ 2,851,955    
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.