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Derivative Financial Instruments and Hedging Activities - Summary of Changes in Notional Balances of Holdings of Derivatives (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 10,010 $ 6,065 $ 15,494
IRLCs [Member]      
Derivative Notional Balance [Roll Forward]      
Notional Amount, beginning balance 239,406 751,436  
Additions 4,210,647 4,710,504  
Amortization 0 94,571  
Maturities (3,727,042) (4,280,676)  
Terminations (337,938) (1,036,429)  
Notional Amount, ending balance 385,073 239,406  
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 10,010 $ 6,065 8,433
Maturity Oct. 2015 - Dec. 2015 Feb. 2015 - Mar. 2015  
Forward Mortgage Backed Securities Trades [Member]      
Derivative Notional Balance [Roll Forward]      
Notional Amount, beginning balance $ 703,725 [1] $ 950,648  
Additions 6,248,108 [1] 8,657,112  
Amortization 0 [1] 0  
Maturities (3,414,877) [1] (3,366,349)  
Terminations (2,864,057) [1] (5,537,686)  
Notional Amount, ending balance [1] 672,899 703,725  
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ (3,438) [1] $ (2,854) [1] 6,905
Maturity Nov. 2015 - Dec. 2015 [1] Feb. 2015 - Mar. 2015 (1) [2]  
Interest Rate Cap [Member]      
Derivative Notional Balance [Roll Forward]      
Notional Amount, beginning balance $ 1,729,000 $ 1,868,000  
Additions 2,179,333 1,100,000  
Amortization (439,333) (1,239,000)  
Maturities 0 0  
Terminations 0 0  
Notional Amount, ending balance 3,469,000 1,729,000  
Fair value of derivative assets (liabilities) at:      
Derivatives, at fair value $ 1,501 $ 567 $ 442
Maturity Nov. 2016 - Oct. 2017 Nov. 2016 - Oct. 2017  
Interest Rate Swaps [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 $ 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 commitments and originations and expected time to sell.
[2] 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 commitments and originations and expected time to sell.