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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Approved and authorized maximum number of shares to be issued (in shares)             2,400,000
Compensation expense related to stock based awards outstanding   $ 858   $ 869 $ 1,200 $ 1,300  
Exercise of stock options (in shares)   55,953   0 159,808 3,924  
Proceeds received upon exercise of stock options   $ 316     $ 940 $ 8  
Potential antidilutive securities excluded from future computations of earnings, amount   2,251,034   2,358,684 2,243,763 2,239,139  
Total unrecognized compensation expense   $ 4,900     $ 4,900    
Share-based compensation cost not yet recognized, period for recognition     2 years        
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, expiration period         10 years    
Options granted in period, shares 425,204            
Forfeiture rate         5.50%    
Stock options | Minimum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, vesting period         3 years    
Stock options | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Options, vesting period         5 years    
Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate         5.50%    
Officers and Executives | Restricted Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted in period (in shares) 345,913            
Weighted average grant date fair value (in dollars per share) $ 7.22            
Executive Officer | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted in period (in shares) 69,945            
Performance period 2 years            
Weighted average grant date fair value (in dollars per share) $ 7.22            
2017 LTIP | Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Forfeiture rate         3.20%