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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Valuation allowance | $ (21,558) | $ (26,581) | $ (31,029) | $ (19,279) | $ (20,089) | $ (17,779)
Mortgage loans, carrying value | 4,288,742 |  | 4,165,489 |  |  |
Commercial Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal outstanding | 3,325,371 |  | 3,580,154 |  |  |
Deferred fees and costs, net | (1,387) |  | (1,266) |  |  |
Mortgage loans, amortized cost | 3,323,984 |  | 3,578,888 |  |  |
Valuation allowance | (17,690) | (22,498) | (25,529) | (17,129) | (18,119) | (17,579)
Mortgage loans, carrying value | 3,306,294 |  | 3,553,359 |  |  |
Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal outstanding | 354,743 |  | 245,807 |  |  |
Deferred fees and costs, net | (1,002) |  | (634) |  |  |
Mortgage loans, amortized cost | 353,741 |  | 245,173 |  |  |
Valuation allowance | (628) | (454) | (2,130) | (300) | (320) | (200)
Mortgage loans, carrying value | 353,113 |  | 243,043 |  |  |
Residential Mortgage Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Principal outstanding | 610,635 |  | 366,320 |  |  |
Deferred fees and costs, net | 1,479 |  | 925 |  |  |
Unamortized discounts and premiums, net | 20,461 |  | 5,212 |  |  |
Mortgage loans, amortized cost | 632,575 |  | 372,457 |  |  |
Valuation allowance | (3,240) | $ (3,629) | (3,370) | $ (1,850) | $ (1,650) | $ 0
Mortgage loans, carrying value | $ 629,335 |  | $ 369,087 |  |  |

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