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Basis of Presentation - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
partnership
Variable Interest Entity [Line Items]        
Consolidation of multifamily loans held in securitization trusts   $ 3,849,779 $ (1,481,554)  
Consolidation of multifamily ABS   $ 3,706,789 $ (1,408,002)  
Deconsolidation, realized market valuation gain (loss) $ (72,000)      
Number of partnerships consolidated | partnership       2
VIE, ownership interest rate   80.00%    
Multifamily loans        
Variable Interest Entity [Line Items]        
Consolidation of multifamily loans held in securitization trusts 3,860,000      
Consolidation of multifamily ABS $ 3,720,000