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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