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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Valuation allowance | $ (45,082) | $ (40,395) | $ (36,972) |  | $ (35,604) | $ (32,388) | $ (24,024)
Mortgage loans, carrying value | 7,494,983 |  | 6,949,027 | [1] |  |  |
Commercial Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Principal outstanding | 3,534,502 |  | 3,560,903 |  |  |  |
Deferred fees and costs, net | (3,903) |  | (6,345) |  |  |  |
Unamortized discounts and premiums, net | (1,593) |  | 0 |  |  |  |
Mortgage loans, amortized cost | 3,529,006 |  | 3,554,558 |  |  |  |
Valuation allowance | (21,802) | (21,330) | (22,428) |  | (23,613) | (24,244) | (17,926)
Mortgage loans, carrying value | 3,507,204 |  | 3,532,130 |  |  |  |
Agricultural Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Principal outstanding | 585,020 |  | 567,630 |  |  |  |
Deferred fees and costs, net | (1,707) |  | (1,667) |  |  |  |
Mortgage loans, amortized cost | 583,313 |  | 565,963 |  |  |  |
Valuation allowance | (1,105) | (895) | (1,021) |  | (810) | (664) | (519)
Mortgage loans, carrying value | 582,208 |  | 564,942 |  |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Principal outstanding | 3,359,939 |  | 2,807,652 |  |  |  |
Deferred fees and costs, net | 669 |  | 1,909 |  |  |  |
Unamortized discounts and premiums, net | 67,138 |  | 55,917 |  |  |  |
Mortgage loans, amortized cost | 3,427,746 |  | 2,865,478 |  |  |  |
Valuation allowance | (22,175) | $ (18,170) | (13,523) |  | $ (11,181) | $ (7,480) | $ (5,579)
Mortgage loans, carrying value | $ 3,405,571 |  | $ 2,851,955 |  |  |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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