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Real Estate Securities - Components of Carrying Value (Which Equals Fair Value) of Residential Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Principal balance | $ 238,459 |  | $ 283,284
Credit reserve | (29,448) |  | (44,967)
Unamortized discount, net | (88,108) |  | (95,718)
Amortized cost | 120,903 |  | 142,599
Gross unrealized gains | 79,406 |  | 77,294
Gross unrealized losses | (33) |  | (1,047)
CECL allowance | 0 | $ 0 | (388)
Carrying Value | 200,276 |  | 218,458
Mezzanine |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Principal balance | 0 |  | 2,000
Credit reserve | 0 |  | 0
Unamortized discount, net | 0 |  | 0
Amortized cost | 0 |  | 2,000
Gross unrealized gains | 0 |  | 14
Gross unrealized losses | 0 |  | 0
CECL allowance | 0 |  | 0
Carrying Value | 0 |  | 2,014
Subordinate |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Principal balance | 238,459 |  | 281,284
Credit reserve | (29,448) |  | (44,967)
Unamortized discount, net | (88,108) |  | (95,718)
Amortized cost | 120,903 |  | 140,599
Gross unrealized gains | 79,406 |  | 77,280
Gross unrealized losses | (33) |  | (1,047)
CECL allowance | 0 |  | (388)
Carrying Value | $ 200,276 |  | $ 216,444

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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