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Premises and Equipment and Assets Held For Sale - Additional Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Property Plant And Equipment [Abstract]      
Depreciation and amortization of premises and equipment | $ $ 5,193 $ 5,060 $ 5,800
Number of branches closure | item 2 12 16