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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance | $ (29,269) | $ (24,024) | $ (28,514) | $ (31,029)
Mortgage loans, carrying value | 5,734,872 | 5,687,998 |  |
Commercial Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 3,610,872 | 3,633,131 |  |
Deferred fees and costs, net | (4,873) | (4,629) |  |
Mortgage loans, amortized cost | 3,605,999 | 3,628,502 |  |
Valuation allowance | (24,587) | (17,926) | (26,139) | (25,529)
Mortgage loans, carrying value | 3,581,412 | 3,610,576 |  |
Agricultural Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 464,431 | 408,135 |  |
Deferred fees and costs, net | (1,344) | (1,136) |  |
Mortgage loans, amortized cost | 463,087 | 406,999 |  |
Valuation allowance | (558) | (519) | (439) | (2,130)
Mortgage loans, carrying value | 462,529 | 406,480 |  |
Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 1,669,897 | 1,652,910 |  |
Deferred fees and costs, net | 1,432 | 1,468 |  |
Unamortized discounts and premiums, net | 23,726 | 22,143 |  |
Mortgage loans, amortized cost | 1,695,055 | 1,676,521 |  |
Valuation allowance | (4,124) | (5,579) | $ (1,936) | $ (3,370)
Mortgage loans, carrying value | $ 1,690,931 | $ 1,670,942 |  |

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