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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deposits [Abstract]    
Deposits - interest bearing $ 18,942,082 $ 15,504,330
Deposits - non-interest bearing 1,076 1,053
Total deposits $ 18,943,158 $ 15,505,383