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Loans Held for Sale - Summary of Activity in Gain on Loans Held for Sale, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans Held For Sale At Fair Value [Abstract]              
Gain (Loss) on Sale of Securities, Net $ 34,038 $ 42,185 $ 130,425 $ 145,455      
Gain on sales of loans         $ 168,449 $ 82,518 $ 6,797
Change in fair value of IRLCs 4,956 (4,188) 3,944 (2,315) (25,822) 523 2
Change in fair value of loans held for sale 915 (9,348) (5,893) (97) 10,489 (1,709) (5,462)
Gain (loss) on economic hedge instruments         (17,214) 42,732 (1,075)
Loss (gain) on economic hedge instruments (12,416) (1,145) (10,878) (32,183)      
Other (195) (286) (664) (819) (1,605) (2,370) (47)
Gain on loans held for sale, net $ 27,298 $ 27,218 $ 116,934 $ 110,041 $ 134,297 $ 121,694 $ 215