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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

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