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Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Other intangibles, net:    
Other intangibles, net, Beginning balance $ 9,031 $ 9,415
Other intangibles, net, Increase   13
Other intangibles, net, Amortization (584) (397)
Other intangibles, net, Ending balance 8,447 9,031
Goodwill, net, Beginning balance 3,922 3,922
Goodwill, net Ending balance 3,922 3,922
Total goodwill and other intangibles, net $ 12,369 $ 12,953