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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, 2015
Dec. 31, 2014
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 6,367 $ 6,065
IRLCs [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 239,406  
Additions 5,293,280  
Amortization 0  
Maturities (4,773,676)  
Terminations (480,693)  
Notional Amount, ending balance 278,317  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 6,080 6,065
Maturity Dec. 2015 - Mar. 2016  
Forward Mortgage Backed Securities Trades [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance [1] $ 703,725  
Additions [1] 7,887,651  
Amortization [1] 0  
Maturities [1] (4,371,218)  
Terminations [1] (3,587,438)  
Notional Amount, ending balance [1] 632,720  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value [1] $ 295 (2,854)
Maturity [1] Feb. 2016 - Mar 2016  
Interest Rate Cap [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance $ 1,729,000  
Additions 2,261,000  
Amortization (1,880,000)  
Maturities 0  
Terminations 0  
Notional Amount, ending balance 2,110,000  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 2,042 567
Maturity Nov. 2016 - Dec. 2017  
Interest Rate Swap [Member]    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance $ 0  
Additions 450,000  
Amortization 0  
Maturities 0  
Terminations (450,000)  
Notional Amount, ending balance 0  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 0 $ 0
[1] As loans are originated and sold or as loan commitments expire, our forward MBS trade positions mature and are replaced by new positions based upon new loan originations and commitments and expected time to sell.