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Derivative Instruments (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivative [Line Items]      
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 993,334   $ 826,236
Interest rate caps:      
Derivative [Line Items]      
Notional amount $ 1,393,200    
Interest rate caps: | Minimum      
Derivative [Line Items]      
Strike rate 2.43%    
Interest rate caps: | Maximum      
Derivative [Line Items]      
Strike rate 11.61%    
Interest rate caps: | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 685,000 $ 659,500  
Cost of derivative $ 348 $ 347  
Interest rate caps: | Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Strike rate 2.43% 3.00%  
Interest rate caps: | Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Strike rate 7.80% 5.35%  
Interest rate floors:      
Derivative [Line Items]      
Notional amount $ 10,850,000    
Interest rate floors: | Minimum      
Derivative [Line Items]      
Strike rate floor (0.25%)    
Interest rate floors: | Maximum      
Derivative [Line Items]      
Strike rate 2.00%    
Interest rate floors: | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 4,000,000 $ 1,600,000  
Cost of derivative $ 138 $ 65  
Interest rate floors: | Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Strike rate 1.38%    
Interest rate floors: | Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Strike rate 2.00% 1.00%  
Credit Default Swap      
Derivative [Line Items]      
Notional amount $ 50,000    
Maximum exposure 2,300    
Change in market value threshold for settlement $ 250