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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Deposits - interest bearing $ 13,793,200 $ 13,434,990
Deposits - non-interest bearing 1,615 677
Total deposits $ 13,794,815 $ 13,435,667