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Premises and Equipment - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Abstract]      
Depreciation $ 5,720 $ 4,001 $ 2,817
Rent expense $ 3,229 $ 2,261 $ 2,053