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Assets and Liabilities Related to Real Estate Owned, Held for Sale - Narrative (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2021 | May 24, 2021 | Dec. 31, 2020 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2017 | Jun. 30, 2015
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Real estate held-for-sale, impairment |  |  |  |  |  |  | $ 600 |  |  |  |
Total carrying value, net |  |  |  |  | $ 8,350,042 |  |  |  | $ 7,857,260 |  |
Specific CECL (allowance) reversal |  |  | $ 10,000 |  | 30,000 |  | $ 0 |  |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | 242,600 |  |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | 474,900 |  |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1] |  |  |  | 763,488 |  |  |  | 844,948 |  |
Subordinate Mortgage Portfolio Segment | Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific CECL (allowance) reversal |  |  |  |  |  |  |  | $ 10,000 |  |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  | 85,500 |  |  |  | $ 97,800 |  |
Specific CECL (allowance) reversal |  |  |  |  | $ (30,000) |  |  |  |  |  |
Realized loss on investments |  |  |  |  |  | $ 20,000 |  |  |  |  |
Hotel - Anaheim, CA | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for sale |  |  |  |  |  |  |  |  |  | $ 33,000 |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  | $ (2,400) |  |  |  |  |  |  |
Hotel - Washington D.C. |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific CECL (allowance) reversal |  |  |  |  |  | $ 10,000 |  |  |  |  |
Hotel - Washington D.C. | Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  | $ 20,000 | $ 20,000
Hotel - Washington D.C. | Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  | 24,500
Payments to acquire mortgage notes receivable |  |  | 24,500 |  |  |  |  |  |  |  |
Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment |  |  | $ 110,000 |  |  |  |  |  |  |  | $ 110,000
Payments for mortgage loans |  | $ 110,000 |  |  |  |  |  |  |  |  |
[1] | Net of $196,377 and $178,588 CECL Allowances in 2022 and 2021, respectively, comprised of $175,000 and $145,000 Specific CECL Allowance and $21,377 and $33,588 General CECL Allowance, respectively.

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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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