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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Valuation allowance $ (28,514) $ (31,029)
Mortgage loans, carrying value 4,290,602 4,165,489
Commercial Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding 3,547,140 3,580,154
Deferred fees and costs, net (1,213) (1,266)
Amortized cost 3,545,927 3,578,888
Valuation allowance (26,139) (25,529)
Mortgage loans, carrying value 3,519,788 3,553,359
Agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding 266,269 245,807
Deferred fees and costs, net (684) (634)
Amortized cost 265,585 245,173
Valuation allowance (439) (2,130)
Mortgage loans, carrying value 265,146 243,043
Residential Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Principal outstanding 496,135 366,320
Deferred fees and costs, net 1,323 925
Unamortized discounts and premiums, net 10,146 5,212
Amortized cost 507,604 372,457
Valuation allowance (1,936) (3,370)
Mortgage loans, carrying value $ 505,668 $ 369,087