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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Valuation allowance $ (32,388) $ (29,269) $ (24,024) $ (26,581) $ (28,514) $ (31,029)
Mortgage loans, carrying value 6,228,616   5,687,998      
Commercial Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal outstanding 3,608,959   3,633,131      
Deferred fees and costs, net (5,681)   (4,629)      
Mortgage loans, amortized cost 3,603,278   3,628,502      
Valuation allowance (24,244) (24,587) (17,926) (22,498) (26,139) (25,529)
Mortgage loans, carrying value 3,579,034   3,610,576      
Agricultural Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal outstanding 568,180   408,135      
Deferred fees and costs, net (1,716)   (1,136)      
Mortgage loans, amortized cost 566,464   406,999      
Valuation allowance (664) (558) (519) (454) (439) (2,130)
Mortgage loans, carrying value 565,800   406,480      
Residential Mortgage Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Principal outstanding 2,051,305   1,652,910      
Deferred fees and costs, net 1,654   1,468      
Unamortized discounts and premiums, net 38,303   22,143      
Mortgage loans, amortized cost 2,091,262   1,676,521      
Valuation allowance (7,480) $ (4,124) (5,579) $ (3,629) $ (1,936) $ (3,370)
Mortgage loans, carrying value $ 2,083,782   $ 1,670,942