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Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Roll Forward]      
Beginning of year $ 40,231 $ 29,917 $ 29,917
Acquired goodwill 13,546 10,314 0
Impairment 0 0 0
End of year $ 53,777 $ 40,231 $ 29,917