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Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Results of Operations (Unaudited) (Footnote) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |
Gains (losses) on sale of mortgage servicing rights | $ (14,000) | $ 41,200 | $ 30,300 | $ 26,400 | $ 8,492 | $ 83,921 | $ 0

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