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Equity Plans (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 27, 2016
$ / shares
shares
Jan. 26, 2016
$ / shares
shares
Jan. 04, 2016
vesting_installment
$ / shares
shares
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs charged to income:       $ 464 $ 447 $ 1,316 $ 1,208
Excess tax benefits realized from stock issuance:       1 0 203 634
Proceeds from ESPP and similar instruments:       $ 503 462 $ 954 895
Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Remaining shares available for issuance under the Incentive Plan (shares) | shares       993,954   993,954  
Shares issuable upon exercise of Incentive Plan awards (shares) | shares           229,972  
Employee Stock Purchase Plan (ESPP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs charged to income:       $ 89 82 $ 168 158
Proceeds from ESPP and similar instruments:       503 462 954 895
Unrecognized compensation costs       $ 74   $ 74  
Purchase price of common stock under ESPP (percent)           85.00%  
Maximum percentage of base compensation employees can designate for stock purchases under ESPP (percent)       10.00%   10.00%  
Plan expense       $ 51 38 $ 139 120
Restricted stock and deferred restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs charged to income:       375 365 1,148 1,050
Excess tax benefits realized from stock issuance:       1 $ 0 203 $ 634
Unrecognized compensation costs       $ 1,277   $ 1,277  
Recognition period for unrecognized compensation cost           10 months 6 days  
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares     17,835        
Number of equal successive installments for vesting of stock awards (vesting installments) | vesting_installment     3        
Grant date fair value of equity instruments granted (usd per share) | $ / shares     $ 27.02        
Common Stock | Employee Stock Purchase Plan (ESPP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized for issuance under the plan (shares) | shares       400,000   400,000  
Officer | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares   12,473          
Grant date fair value of equity instruments granted (usd per share) | $ / shares   $ 29.46          
Officer | Minimum | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target vesting percentage   0.00%          
Officer | Maximum | Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target vesting percentage   150.00%          
Director | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares 7,656            
Grant date fair value of equity instruments granted (usd per share) | $ / shares $ 35.79