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Derivative Instruments (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Interest rate floors | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 3,000,000,000   $ 5,000,000,000
Interest rate floors | Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Strike rate 0.25%   0.25%
Interest rate floors | Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Strike rate (0.25%)   1.63%
Interest rate caps | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 1,037,500,000   $ 968,000,000
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 870,000,000   $ 870,000,000
Interest rate caps | Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Strike rate 3.00%   3.00%
Interest rate caps | Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Strike rate 4.00%   7.80%
Interest rate caps | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 167,500,000 $ 177,500,000  
Total cost of interest rate caps (in thousands) $ 38,000 $ 55,000  
Interest rate caps | Not Designated as Hedging Instrument | Minimum      
Derivative [Line Items]      
Strike rate 3.00% 3.00%  
Interest rate caps | Not Designated as Hedging Instrument | Maximum      
Derivative [Line Items]      
Strike rate 3.50% 7.80%  
Interest rate floors | Not Designated as Hedging Instrument      
Derivative [Line Items]      
Notional amount $ 0 $ 2,000,000,000  
Strike rate 1.63%  
Total cost of interest rate caps (in thousands) $ 0 $ 75,000  
Credit Default Swap      
Derivative [Line Items]      
Notional amount 50,000,000    
Maximum exposure 2,200,000    
Change in market value threshold for settlement $ 250,000