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Loans Held for Sale - Summary of Activity in the Balance of Loans Held for Sale, at Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Movement In Loans Held For Sale At Fair Value [Roll Forward]          
Beginning balance $ 401,120 $ 503,753 $ 503,753 $ 426,480 $ 0
Originations and purchases 3,119,457 3,923,870 4,967,767 [1] 8,106,742 [1] 670,147 [1]
Proceeds from sales (3,306,180) (4,010,644) (5,015,235) (7,999,235) (241,960)
Principal collections (6,512) (9,156)      
Transfers to loans held for investment - reverse mortgages     (110,874) 0 0
Transfers to loans held for investment - reverse mortgage 0 (110,874) (110,874) 0 0
Gain (loss) on sale of loans 37,580 39,486 49,533 (26,981) 3,889
Other 9,556 [2] 485 [2] 6,176 (3,253) (5,596)
Ending balance $ 235,909 $ 335,950 $ 401,120 $ 503,753 $ 426,480
[1] Purchases include $60.0 million of reverse mortgages acquired in the Liberty Acquisition in 2013 and $558.7 million of forward mortgages acquired in the Homeward Acquisition in 2012.
[2] Other includes the change in fair value of $9.9 million and $1.2 million for the nine months ended September 30, 2015 and 2014, respectively.