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Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]      
Beginning of year $ 29,917,000 $ 29,917,000 $ 29,917,000
Acquired goodwill 10,314,000 0 0
Impairment 0 0 0
End of year $ 40,231,000 $ 29,917,000 $ 29,917,000