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Mortgage Loans on Real Estate (Summary of Mortgage Loan Portfolio) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | [1] | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Valuation allowance | $ (31,029) | $ (17,779) | $ (9,179)
Mortgage loans, carrying value | 4,165,489 |  | 3,448,793
Commercial Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | 3,580,154 |  | 3,407,611
Deferred fees and costs, net | (1,266) |  | (899)
Amortized cost | 3,578,888 |  | 3,406,712
Valuation allowance | (25,529) | (17,579) | (8,979)
Mortgage loans, carrying value | 3,553,359 |  | 3,397,733
Agricultural Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | 245,807 |  | 51,303
Deferred fees and costs, net | (634) |  | (43)
Amortized cost | 245,173 |  | 51,260
Valuation allowance | (2,130) | (200) | (200)
Mortgage loans, carrying value | 243,043 |  | 51,060
Residential Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Principal outstanding | 366,320 |  | 0
Deferred fees and costs, net | 925 |  | 0
Unamortized discounts and premiums, net | 5,212 |  | 0
Amortized cost | 372,457 |  | 0
Valuation allowance | (3,370) | $ 0 | 0
Mortgage loans, carrying value | $ 369,087 |  | $ 0
[1] | (1) Upon adoption of authoritative guidance effective January 1, 2020, we updated our accounting policies and methodology for calculating the general loan loss allowance, resulting in an adjustment to our mortgage loan valuation allowance. See Note 1 - Significant Accounting Policies for further details.

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