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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance $ 284,632 [1] $ 309,054 [1] $ 401,120
Originations and purchases 2,678,372 4,211,871 3,944,509
Proceeds from sales (2,785,422) (4,236,158) (4,061,217)
Principal collections (4,867) (11,620) (8,647)
Transfers from Loans held for investment   0 0
Transfers from Loans held for sale - Lower of cost or fair value 0 3,266 1,200
Gain on sale of loans 35,429 13,421 42,053
Increase (decrease) in fair value of loans 151 (7,030) (9,066)
Other 2,164 1,828 (898)
Ending balance [1] $ 214,262 $ 284,632 $ 309,054
[1] At December 31, 2017, 2016 and 2015, the balances include $5.0 million, $4.9 million and $11.9 million, respectively, of fair value adjustments.