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Secured Financing Agreements - Repurchase Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Secured financing agreements    
Secured Financing Agreements    
Principal Amount $ 9,359,610 $ 8,761,624
Repurchase Agreements    
Secured Financing Agreements    
Outstanding balance 5,442,625 4,289,750
Principal Amount $ 5,442,625  
Percentage of repurchase agreements for which margin calls are limited to collateral specific credit marks 78.00%  
Percentage of repurchase agreements containing margin call provisions that pertain to loans held-for-sale 22.00%  
Repurchase Agreements | Loans held for investment    
Secured Financing Agreements    
Outstanding balance $ 4,466,447 3,567,786
Repurchase Agreements | Loans held-for-sale    
Secured Financing Agreements    
Outstanding balance 314,794 65,559
Repurchase Agreements | Investment securities.    
Secured Financing Agreements    
Outstanding balance $ 661,384 $ 656,405