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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Valuation allowance | $ (36,972) | $ (24,024) | $ (31,029)
Mortgage loans, carrying value | 6,949,027 | 5,687,998 |
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | 3,560,903 | 3,633,131 |
Deferred fees and costs, net | (6,345) | (4,629) |
Mortgage loans, amortized cost | 3,554,558 | 3,628,502 |
Valuation allowance | (22,428) | (17,926) | (25,529)
Mortgage loans, carrying value | 3,532,130 | 3,610,576 |
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | 567,630 | 408,135 |
Deferred fees and costs, net | (1,667) | (1,136) |
Mortgage loans, amortized cost | 565,963 | 406,999 |
Valuation allowance | (1,021) | (519) | (2,130)
Mortgage loans, carrying value | 564,942 | 406,480 |
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | 2,807,652 | 1,652,910 |
Deferred fees and costs, net | 1,909 | 1,468 |
Unamortized discounts and premiums, net | 55,917 | 22,143 |
Mortgage loans, amortized cost | 2,865,478 | 1,676,521 |
Valuation allowance | (13,523) | (5,579) | $ (3,370)
Mortgage loans, carrying value | $ 2,851,955 | $ 1,670,942 |

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