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Derivative Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interest Rate Floor | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount (in thousands) $ 5,000,000,000 $ 10,850,000,000    
Interest Rate Floor | Minimum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (0.25%) (0.25%)    
Interest Rate Floor | Maximum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (1.63%) (2.00%)    
Interest Rate Cap | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount (in thousands) $ 968,000,000 $ 1,292,500,000    
Aggregate principal balance on corresponding mortgage loans (in thousands) $ 870,000,000 $ 805,500,000    
Interest Rate Cap | Minimum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (3.00%) (2.43%)    
Interest Rate Cap | Maximum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (7.80%) (11.61%)    
Interest Rate Cap | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount (in thousands) $ 391,000,000 $ 727,000,000 $ 844,200,000  
Total cost of interest rate floors (in thousands) $ 115,000 $ 362,000 $ 375,000  
Interest Rate Cap | Minimum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (3.00%) (2.43%) (3.00%)  
Interest Rate Cap | Maximum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (7.80%) (7.80%) (11.61%)  
Interest Rate Floor | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Notional amount (in thousands) $ 2,000,000,000 $ 4,000,000,000 $ 3,850,000,000  
Strike rate (1.63%) (1.38%) (1.00%)  
Total cost of interest rate floors (in thousands) $ 75,000 $ 138,000 $ 140,000  
Interest Rate Floor | Maximum | Not Designated as Hedging Instrument        
Derivative [Line Items]        
Strike rate (1.63%) (2.00%) (1.50%)  
Credit Default Swap        
Derivative [Line Items]        
Notional amount (in thousands) $ 50,000,000      
Maximum exposure 1,200,000      
Change in market value threshold for settlement $ 250,000      
Eurodollar Future        
Derivative [Line Items]        
Total cost of interest rate floors (in thousands)   $ 0 $ 0 $ 124,000