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Share-Based Compensation - Restricted Stock Unit's Activity (Details) - USD ($)
3 Months Ended
Feb. 22, 2016
Mar. 31, 2016
Mar. 31, 2015
Additional share-based compensation disclosures      
Compensation expense   $ 201,000 $ 210,000
Options      
Additional share-based compensation disclosures      
The total intrinsic value of all options exercised     600,000
Total amount of consideration received from the exercised options     $ 130,000
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)   17,329  
Shares vested (in shares)   (11,909)  
Unvested at the end of the period (in shares)   46,065  
Weighted Average Award Date Fair Value      
Unvested at the beginning of the period (in dollars per share)   $ 19.67  
Awarded (in dollars per share)   21.64  
Shares vested (in dollars per share)   20.94  
Unvested at the end of the period (in dollars per share)   $ 20.08  
Additional share-based compensation disclosures      
Compensation expense   $ 65,000 $ 66,000
Net-share settlement (in shares)   3,889 3,405
Net-share settlement, market price per share   $ 22.82 $ 23.15
Unrecognized compensation expense   $ 1,200,000  
Weighted average period of recognition of unrecognized compensation expense   4 years  
Director and employees | Options      
Additional share-based compensation disclosures      
Compensation expense   $ 36,000 $ 44,000
Incentive Plan | Chief Executive Officer | Common Stock      
Restricted Stock Units      
Awards $ 400,000    
Additional share-based compensation disclosures      
Compensation expense   $ 100,000 $ 100,000
Awards $ 400,000