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Stock-Based Employee Compensation Plans - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2013
May 31, 2010
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options outstanding (in shares)     1,077,352 1,009,101 1,077,352 1,009,101 838,696 1,257,390
Options granted (in shares)       0 379,551 112,828    
Options exercised (in shares)     41,780 22,252 83,158 226,564    
Aggregate intrinsic value of options exercised     $ 110 $ 21 $ 239 $ 343    
Fair value of options vested     40 96 154 170    
Aggregate intrinsic values of options outstanding and exercisable     680   $ 680   $ 904  
Nonvested awards, expected weighted average recognition period         2 years 8 months 23 days      
Aggregate amounts of stock based compensation expense, net of taxes     $ 276 $ 367 $ 553 $ 683    
Restricted stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of accumulated shares vested (in shares)     (154,834)   (154,834)      
Restricted stock | Employees                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options, restricted shares and SARs, vesting period         3 years      
Restricted stock | Directors                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options, restricted shares and SARs, vesting period         1 year      
Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Purchase price per share of common stock as percentage of fair market value of shares on respective grant dates of stock options         100.00%      
Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options, restricted shares and SARs, vesting period         5 years      
Options and SARs, terms after date of grant         10 years      
Equity Incentive Plan 2010                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized (in shares)   400,000 1,565,031   1,565,031      
Additional shares authorized (in shares) 800,000              
Maximum number of shares available for grant, percent of common stock outstanding         7.00%      
Previously Approved Equity Incentive Plans                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Additional shares authorized (in shares)   158,211            
Options outstanding (in shares)     361,654   361,654