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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Valuation allowance | $ (40,395) | $ (45,626) | $ (36,972) |  | $ (32,388) | $ (29,269) | $ (24,024)
Mortgage loans, carrying value | 7,373,609 |  | 6,949,027 | [1] |  |  |
Commercial Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Principal outstanding | 3,535,506 |  | 3,560,903 |  |  |  |
Deferred fees and costs, net | (4,316) |  | (6,345) |  |  |  |
Unamortized discounts and premiums, net | (1,821) |  | 0 |  |  |  |
Mortgage loans, amortized cost | 3,529,369 |  | 3,554,558 |  |  |  |
Valuation allowance | (21,330) | (25,082) | (22,428) |  | (24,244) | (24,587) | (17,926)
Mortgage loans, carrying value | 3,508,039 |  | 3,532,130 |  |  |  |
Agricultural Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Principal outstanding | 582,660 |  | 567,630 |  |  |  |
Deferred fees and costs, net | (1,719) |  | (1,667) |  |  |  |
Mortgage loans, amortized cost | 580,941 |  | 565,963 |  |  |  |
Valuation allowance | (895) | (1,356) | (1,021) |  | (664) | (558) | (519)
Mortgage loans, carrying value | 580,046 |  | 564,942 |  |  |  |
Residential Mortgage Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Principal outstanding | 3,236,400 |  | 2,807,652 |  |  |  |
Deferred fees and costs, net | 1,068 |  | 1,909 |  |  |  |
Unamortized discounts and premiums, net | 66,226 |  | 55,917 |  |  |  |
Mortgage loans, amortized cost | 3,303,694 |  | 2,865,478 |  |  |  |
Valuation allowance | (18,170) | $ (19,188) | (13,523) |  | $ (7,480) | $ (4,124) | $ (5,579)
Mortgage loans, carrying value | $ 3,285,524 |  | $ 2,851,955 |  |  |  |
[1] | Certain prior period amounts have been recast. See Note 1 - Significant Accounting Policies for more information.

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