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Share-Based Compensation - Restricted Stock Unit's Activity (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 09, 2016
Feb. 22, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Additional share-based compensation disclosures            
Weighted-average grant-date fair value $ 6.11          
Compensation expense     $ 441,000 $ 436,000 $ 642,000 $ 647,000
Options            
Additional share-based compensation disclosures            
The total intrinsic value of all options exercised         518,000 696,000
Total amount of consideration received from the exercised options         $ 449,000 $ 223,000
Shares surrendered in lieu of payment of exercise price and withholding taxes         0 0
Restricted Stock Units            
Restricted Stock Units            
Unvested at the beginning of the period (in shares)         40,645  
Awarded (in shares)         17,822  
Shares vested (in shares)         (11,909)  
Unvested at the end of the period (in shares)     46,558   46,558  
Weighted Average Award Date Fair Value            
Unvested at the beginning of the period (in dollars per share)         $ 19.67  
Awarded (in dollars per share)         21.66  
Shares vested (in dollars per share)         20.94  
Unvested at the end of the period (in dollars per share)     $ 20.00   $ 20.00  
Additional share-based compensation disclosures            
Compensation expense     $ 95,000 82,000 $ 160,000 $ 149,000
Net-share settlement (in shares)         3,889 3,405
Net-share settlement, market price per share         $ 22.82 $ 23.15
Unrecognized compensation expense     1,100,000   $ 1,100,000  
Weighted average period of recognition of unrecognized compensation expense         3 years 9 months  
Director and employees | Options            
Additional share-based compensation disclosures            
Compensation expense     141,000 149,000 $ 177,000 $ 193,000
Incentive Plan | Chief Executive Officer | Common Stock            
Restricted Stock Units            
Awards   $ 400,000        
Additional share-based compensation disclosures            
Compensation expense     $ 100,000 $ 100,000 $ 200,000 $ 200,000
Awards   $ 400,000