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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Deposits - interest bearing $ 19,662,290 $ 18,942,082
Deposits - non-interest bearing 1,696 1,076
Total deposits $ 19,663,986 $ 18,943,158