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Goodwill and Intangible Assets - Change in Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]      
Beginning of year $ 53,777 $ 53,777  
Acquired goodwill 0 0 $ 13,546
Impairment 0 0 0
End of year $ 53,777 $ 53,777 $ 53,777