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Share-Based Compensation Plan Narrative (Details)
12 Months Ended
May. 06, 2015
director
shares
Dec. 31, 2015
USD ($)
share_based_compensation_plan
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of plans | share_based_compensation_plan   1    
Share based compensation expense | $   $ 605,000 $ 426,000 $ 492,000
Total income tax benefit related to share-based compensation | $   117,000 $ 63,000 $ 54,000
Unrecognized compensation expense related to nonvested stock options awards | $   $ 0    
Options granted (in shares)   0 0 0
Aggregate intrinsic value of options exercised | $   $ 126,500 $ 11,100  
Aggregate intrinsic value of options outstanding | $   $ 134,500 $ 120,300 $ 160,300
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service-based award vesting percentage   50.00%    
Restricted Stock [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Service-based award vesting percentage   100.00%    
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Options vesting percentage each on first and second anniversary   25.00%    
Options vesting percentage on third anniversary   50.00%    
2006 Equity Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares)     430,000 255,000
Number of additional shares authorized     175,000  
2006 Equity Compensation Plan [Member] | Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 31,750      
2006 Equity Compensation Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)   36,150 41,533 32,500
Restricted stock nonvested outstanding, Weighted average remaining contractual terms   2 years 8 months 12 days 3 years 6 months 18 days 3 years 10 months 24 days
Unrecognized compensation expense related to nonvested restricted stock awards | $   $ 1,400,000    
2006 Equity Compensation Plan [Member] | Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 4,400      
Number of directors | director 11      
Shares of restricted stock per director 400