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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 10,027   $ 9,279
Interest Rate Lock Commitments [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2016 360,450    
Additions 1,427,753    
Amortization 0    
Maturities (1,149,358)    
Terminations (247,899)    
Notional balance at March 31, 2017 $ 390,946    
Maturity Apr. 2017 - Jun. 2017    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 7,765   6,507
Gains (losses) on derivatives during the three months ended:      
Gains (losses) on derivatives 1,060 $ 7,465  
Forward MBS Trades [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2016 609,177    
Additions 971,499    
Amortization 0    
Maturities (379,055)    
Terminations (600,812)    
Notional balance at March 31, 2017 $ 600,809    
Maturity Jun. 2017    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ (3,868)   (614)
Gains (losses) on derivatives during the three months ended:      
Gains (losses) on derivatives (2,514) (13,202)  
Interest Rate Caps [Member]      
Derivative Notional Balance      
Notional balance at December 31, 2016 955,000    
Additions 0    
Amortization (90,000)    
Maturities 0    
Terminations 0    
Notional balance at March 31, 2017 $ 865,000    
Maturity Oct. 2017 - Dec. 2018    
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 2,262   $ 1,836
Gains (losses) on derivatives during the three months ended:      
Gains (losses) on derivatives $ 359 $ (1,496)