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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Banking and Thrift [Abstract]    
Deposits - interest bearing $ 15,033,524 $ 13,434,990
Deposits - non-interest bearing 528 677
Total deposits $ 15,034,052 $ 13,435,667