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Related Party Transactions - Schedule of Balance Sheet of Related Party Transaction (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Related Party Transaction [Line Items] |  |  |
Carrying value (fair value) |  | $ 424,600 | $ 273,800
Beneficial interests in securitization trusts |  |  |
Related Party Transaction [Line Items] |  |  |
Carrying value (fair value) | [1] | 133,484 | 91,418
Receivable from servicer | Gregory |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  | 23,907 | 15,755
Mortgage loans, net | Gaea Real Estate Corp. |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  | 7,007 | 11,000
Mortgage loans, net | Servicer |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  |  | 1,838
Management fee payable | Thetis Asset Management LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  | 2,267 | 2,247
Prepaid expenses and other assets |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  | 1,346 | 876
Prepaid expenses and other assets | Gregory |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  | $ (80) | (44)
Prepaid expenses and other assets | Thetis Asset Management LLC |  |  |
Related Party Transaction [Line Items] |  |  |
Amount of transaction |  |  | $ 18
[1] | Investments in beneficial interests includes allowance for credit losses of $3.0 million and $4.5 million at June 30, 2021 and December 31, 2020, respectively.

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