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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Banking and Thrift [Abstract]    
Deposits - interest bearing $ 16,743,885 $ 15,504,330
Deposits - non-interest bearing 2,072 1,053
Total deposits $ 16,745,957 $ 15,505,383