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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Valuation allowance $ (45,082) $ (40,395) $ (36,972) $ (35,604) $ (32,388) $ (24,024)
Mortgage loans, carrying value 7,494,983   6,949,027 [1]      
Commercial Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal outstanding 3,534,502   3,560,903      
Deferred fees and costs, net (3,903)   (6,345)      
Unamortized discounts and premiums, net (1,593)   0      
Mortgage loans, amortized cost 3,529,006   3,554,558      
Valuation allowance (21,802) (21,330) (22,428) (23,613) (24,244) (17,926)
Mortgage loans, carrying value 3,507,204   3,532,130      
Agricultural Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal outstanding 585,020   567,630      
Deferred fees and costs, net (1,707)   (1,667)      
Mortgage loans, amortized cost 583,313   565,963      
Valuation allowance (1,105) (895) (1,021) (810) (664) (519)
Mortgage loans, carrying value 582,208   564,942      
Residential Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal outstanding 3,359,939   2,807,652      
Deferred fees and costs, net 669   1,909      
Unamortized discounts and premiums, net 67,138   55,917      
Mortgage loans, amortized cost 3,427,746   2,865,478      
Valuation allowance (22,175) $ (18,170) (13,523) $ (11,181) $ (7,480) $ (5,579)
Mortgage loans, carrying value $ 3,405,571   $ 2,851,955      
[1] Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.