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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Valuation allowance | $ (42,013) | $ (38,135) | $ (45,626) | $ (36,972)
Mortgage loans, carrying value | 7,281,831 | 7,537,594 |  |
Commercial Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 3,480,752 | 3,550,204 |  |
Deferred fees and costs, net | (2,826) | (2,494) |  |
Unamortized discounts and premiums, net | (2,317) | (2,711) |  |
Mortgage loans, amortized cost | 3,475,609 | 3,544,999 |  |
Valuation allowance | (20,432) | (17,902) | (25,082) | (22,428)
Mortgage loans, carrying value | 3,455,177 | 3,527,097 |  |
Agricultural Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 576,185 | 581,287 |  |
Deferred fees and costs, net | (1,600) | (1,654) |  |
Mortgage loans, amortized cost | 574,585 | 579,633 |  |
Valuation allowance | (1,202) | (2,590) | (1,356) | (1,021)
Mortgage loans, carrying value | 573,383 | 577,043 |  |
Residential Mortgage Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Principal outstanding | 3,207,707 | 3,384,737 |  |
Deferred fees and costs, net | 453 | 558 |  |
Unamortized discounts and premiums, net | 65,490 | 65,802 |  |
Mortgage loans, amortized cost | 3,273,650 | 3,451,097 |  |
Valuation allowance | (20,379) | (17,643) | $ (19,188) | $ (13,523)
Mortgage loans, carrying value | $ 3,253,271 | $ 3,433,454 |  |

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