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Basis of Presentation - Narrative (Details) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 15, 2019 USD ($) | Mar. 01, 2019 USD ($) | Oct. 31, 2019 USD ($) | May 31, 2018 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) partnership | Dec. 31, 2018 partnership
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Number of partnerships consolidated | partnership |  |  |  |  |  |  |  |  | 2 | 2
VIE, ownership interest rate (as a percent) |  |  |  |  |  |  | 80.00% |  |  |
Deconsolidation, realized market valuation gain (loss) |  |  |  |  | $ (72,000) |  |  |  |  |
Acquisition-related equity compensation expense |  |  |  |  |  |  | $ 3,813 | $ 4,848 | $ 1,010 |
Gain on re-measurement of 5 Arches investment |  |  |  |  |  |  | 0 | 0 | 2,441 |
Acquisition related costs |  |  |  |  |  |  |  | 0 | 3,218 |
Amortization of Intangible Assets |  |  |  |  |  |  | 15,000 | 16,000 |  |
Goodwill impairment expense |  |  |  |  | 89,000 |  | 0 | 88,675 | 0 |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire equity method investment |  |  |  | $ 10,000 |  |  |  |  |  |
Option to purchase additional equity, term |  |  |  | 1 year |  |  |  |  |  |
Multifamily securities |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Consolidation of multifamily loans held in securitization trusts |  |  |  |  | 3,860,000 |  |  |  |  |
Consolidation of multifamily ABS |  |  |  |  | $ 3,720,000 |  |  |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Minority interest (as a percent) |  |  |  | 20.00% |  |  |  |  |  |
Option to purchase additional equity (as a percent) |  | 80.00% |  |  |  |  |  |  |  |
Cash |  | $ 12,575 |  |  |  |  |  |  |  |
Contingent consideration maximum amount |  | 27,000 |  |  |  |  |  |  |  |
Contingent consideration performance term |  |  |  | 2 years |  |  |  |  |  |
Gain on re-measurement of 5 Arches investment |  |  |  |  |  | $ 2,000 |  |  |  |
Acquisition related costs |  |  |  |  |  |  | 0 |  |  |
Intangible assets |  | 24,800 |  |  |  |  |  |  |  |
Goodwill |  | $ 28,747 |  |  |  |  |  |  |  |
CoreVest LLC |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Cash | $ 482,311 |  | $ 482,000 |  |  |  |  |  |  |
Contingent consideration performance term | 2 years |  |  |  |  |  |  |  |  |
Total consideration |  |  | 492,000 |  |  |  |  |  |  |
Restricted stock awards | $ 10,000 |  | 10,000 |  |  |  |  |  |  |
Acquisition-related equity compensation expense |  |  | $ 10,000 |  |  |  |  |  |  |
Intangible assets | 56,500 |  |  |  |  |  |  |  |  |
Goodwill | $ 59,928 |  |  |  |  |  |  |  |  |
5 Arches LLC And CoreVest |  |  |  |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | 2,000 |
Amortization of Intangible Assets |  |  |  |  |  |  | $ 39,739 | $ 24,435 |  |
Goodwill |  |  |  |  |  |  |  |  | 89,000 |
Goodwill deductible for tax purposes |  |  |  |  |  |  |  |  | $ 75,000 |

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