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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Deposits - interest bearing $ 21,176,022 $ 18,942,082
Deposits - non-interest bearing 2,112 1,076
Total deposits $ 21,178,134 $ 18,943,158