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- Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
partnership
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]          
Consolidation of multifamily loans held in securitization trusts $ 3,849,779 $ 0      
Consolidation of multifamily ABS $ 3,706,789 $ 0      
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