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Schedule IV - Mortgage Loans on Real Estate - Schedule of Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 206,332 |  |  |
Carrying amount of mortgages | 211,488 | $ 496,553 | $ 561,761 | $ 730,515
Reserves on impaired loans | 600 |  |  |
Borrower A |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | 0 |  |  |
Face Amount of Mortgages | 14,350 |  |  |
Carrying amount of mortgages | $ 14,320 |  |  |
Borrower A | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower A | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower B |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 54,151 |  |  |
Carrying amount of mortgages | $ 59,063 |  |  |
Borrower B | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.75% |  |  |
Borrower B | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 6.75% |  |  |
Borrower C |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 52,230 |  |  |
Carrying amount of mortgages | $ 52,161 |  |  |
Borrower C | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 4.75% |  |  |
Borrower C | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 4.75% |  |  |
Borrower D |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 28,337 |  |  |
Carrying amount of mortgages | $ 28,394 |  |  |
Borrower D | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower D | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower E |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 29,952 |  |  |
Carrying amount of mortgages | $ 30,128 |  |  |
Borrower E | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Borrower E | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.25% |  |  |
Senior mortgages individually less than 3 percent |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | $ 0 |  |  |
Face Amount of Mortgages | 14,859 |  |  |
Carrying amount of mortgages | $ 14,965 |  |  |
Senior mortgages individually less than 3 percent | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 9.68% |  |  |
Senior mortgages individually less than 3 percent | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 9.68% |  |  |
Senior mortgages individually less than 3 percent | LIBOR | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.00% |  |  |
Senior mortgages individually less than 3 percent | LIBOR | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable rate (as a percent) | 5.00% |  |  |
Subordinate mortgages individually less than 3 percent |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 12,453 |  |  |
Carrying amount of mortgages | $ 12,457 |  |  |
Subordinate mortgages individually less than 3 percent | Contractual Interest Accrual Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 6.80% |  |  |
Subordinate mortgages individually less than 3 percent | Contractual Interest Payment Rates |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Fixed interest rate (as a percent) | 6.80% |  |  |
Subordinate mortgages |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Face Amount of Mortgages | $ 12,453 |  |  |
Carrying amount of mortgages | $ 12,457 |  |  |

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