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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance $ 309,054 [1] $ 401,120 [1] $ 503,753
Originations and purchases 4,211,871 3,944,509 4,967,767
Proceeds from sales (4,236,158) (4,061,217) (5,001,935)
Principal collections (11,620) (8,647) (13,300)
Transfers to loans held for investment - reverse mortgages 0 0 (110,874)
Transfers from loans held for sale at lower of cost or fair value 3,266 1,200 0
Gain on sale of loans 13,421 42,053 49,533
Increase (decrease) in fair value of loans (7,030) (9,066) 6,198
Other 1,828 (898) (22)
Ending balance [1] $ 284,632 $ 309,054 $ 401,120
[1] At December 31, 2016, 2015 and 2014, the balances include $4.9 million, $11.9 million and $21.0 million, respectively, of fair value adjustments.