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Employee Benefits and Stock Compensation - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Contribution Plan, Cost Recognized $ 1.7 $ 1.5 $ 1.2
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date 95.00%    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Unit Percentage Of Grantee Earning 0.00%    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share Based Compensation Arrangement By Share Based Payment Award Restricted Stock Unit Percentage Of Grantee Earning 175.00%    
2013 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,200,000