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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair value of derivative assets (liabilities) (2) at:          
Derivatives, at fair value $ 7,852   $ 7,852   $ 9,279
Gains (losses) on derivatives during the nine months ended:          
Losses on economic hedges (350) $ (45) (207) $ (1,950)  
Gains (losses) on derivatives (395) $ (134) (364) (2,213)  
Interest Rate Lock Commitments [Member]          
Derivative Notional Balance          
Notional balance at December 31, 2016     360,450    
Additions     3,192,031    
Amortization     0    
Maturities     (2,728,640)    
Terminations     (617,050)    
Notional balance at September 30, 2017 206,791   $ 206,791    
Maturity     Oct. 2017 - Dec. 2017    
Fair value of derivative assets (liabilities) (2) at:          
Derivatives, at fair value [1] 4,969   $ 4,969   6,507
Gains (losses) on derivatives during the nine months ended:          
Gains (losses) on derivatives     (1,605) 4,148  
Forward MBS Trades [Member]          
Derivative Notional Balance          
Notional balance at December 31, 2016     609,177    
Additions     2,094,533    
Amortization     0    
Maturities     (1,340,603)    
Terminations     (993,407)    
Notional balance at September 30, 2017 369,700   $ 369,700    
Maturity     Oct. 2017 - Nov. 2017    
Fair value of derivative assets (liabilities) (2) at:          
Derivatives, at fair value [1] 973   $ 973   (614)
Gains (losses) on derivatives during the nine months ended:          
Gains (losses) on derivatives     (8,604) $ (25,677)  
Interest Rate Caps [Member]          
Derivative Notional Balance          
Notional balance at December 31, 2016 [2]     955,000    
Additions [2]     110,000    
Amortization [2]     (316,667)    
Maturities [2]     0    
Terminations [2]     (300,000)    
Notional balance at September 30, 2017 [2] 448,333   $ 448,333    
Maturity     Oct. 2017 - May 2019    
Fair value of derivative assets (liabilities) (2) at:          
Derivatives, at fair value [1] $ 1,839   $ 1,839   $ 1,836
[1] Derivatives are reported at fair value in Other assets or in Other liabilities on our unaudited consolidated balance sheets.
[2] Excludes commitments on two interest rate caps we entered into in August 2017 which are related to the OMART advance financing facility and which become effective in November 2017. These interest rate caps have a notional value and fair value of $23.3 million and $0.8 million at September 30, 2017, respectively.