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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill, decrease during measurement period $ 0 $ 94  
Core deposit intangible 3,400    
Acquisition of insurance contract relationships 300    
Amortization expense on finite-lived intangible assets $ 1,200 $ 1,600 $ 1,800