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Derivative Financial Instruments and Hedging Activities - Summary of Changes in Notional Balances of Holdings of Derivatives (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 9,279 $ 6,367
IRLCs [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 278,317  
Additions 6,711,653  
Amortization 0  
Maturities (5,236,398)  
Terminations (1,393,122)  
Notional Amount, ending balance 360,450  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 6,507 6,080
Maturity Jan. 2017 - May 2017  
Forward Mortgage Backed Securities Trades [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance $ 632,720  
Additions 5,529,405  
Amortization 0  
Maturities (2,820,929)  
Terminations (2,732,019)  
Notional Amount, ending balance 609,177  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ (614) 295
Maturity Mar. 2017  
Interest Rate Cap [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance $ 2,110,000  
Additions 703,333  
Amortization (793,333)  
Maturities 0  
Terminations (1,065,000)  
Notional Amount, ending balance 955,000  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 1,836 $ 2,042
Maturity Oct. 2017 - Dec. 2018