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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Valuation allowance | $ (35,604) | $ (32,388) | $ (24,024) | $ (21,558) | $ (26,581) | $ (31,029)
Mortgage loans, carrying value | 6,601,445 |  | 5,687,998 |  |  |
Commercial Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal outstanding | 3,589,852 |  | 3,633,131 |  |  |
Deferred fees and costs, net | (6,260) |  | (4,629) |  |  |
Mortgage loans, amortized cost | 3,583,592 |  | 3,628,502 |  |  |
Valuation allowance | (23,613) | (24,244) | (17,926) | (17,690) | (22,498) | (25,529)
Mortgage loans, carrying value | 3,559,979 |  | 3,610,576 |  |  |
Agricultural Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal outstanding | 582,518 |  | 408,135 |  |  |
Deferred fees and costs, net | (1,723) |  | (1,136) |  |  |
Mortgage loans, amortized cost | 580,795 |  | 406,999 |  |  |
Valuation allowance | (810) | (664) | (519) | (628) | (454) | (2,130)
Mortgage loans, carrying value | 579,985 |  | 406,480 |  |  |
Residential Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal outstanding | 2,423,962 |  | 1,652,910 |  |  |
Deferred fees and costs, net | 1,441 |  | 1,468 |  |  |
Unamortized discounts and premiums, net | 47,259 |  | 22,143 |  |  |
Mortgage loans, amortized cost | 2,472,662 |  | 1,676,521 |  |  |
Valuation allowance | (11,181) | $ (7,480) | (5,579) | $ (3,240) | $ (3,629) | $ (3,370)
Mortgage loans, carrying value | $ 2,461,481 |  | $ 1,670,942 |  |  |

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