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Equity Plans (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 29, 2015
vesting_installment
$ / shares
shares
Jan. 27, 2015
$ / shares
shares
Jan. 02, 2015
vesting_installment
$ / shares
shares
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
shares
Sep. 30, 2014
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs charged to income:       $ 447 $ 323 $ 1,208 $ 774
Excess tax benefits realized from share options exercised and stock issuance:       0 (3) 634 306
Proceeds from the exercise of stock options and similar instruments:       $ 462 433 $ 895 917
Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Remaining shares available for issuance under the Incentive Plan (shares) | shares       1,037,068   1,037,068  
Shares issuable upon exercise of Incentive Plan awards (shares) | shares           245,976  
Employee Stock Purchase Plan (ESPP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs charged to income:       $ 82 76 $ 158 148
Proceeds from the exercise of stock options and similar instruments:       462 433 895 839
Unrecognized compensation costs       $ 50   $ 50  
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       $ 38 37 $ 120 112
Dividend Reinvestment and Stock Purchase Plan (DRSPP)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Proceeds from the exercise of stock options and similar instruments:       0 0 0 $ 34
Number of shares issued under the DRSPP (shares) | shares             1,151
Restricted stock and deferred restricted stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation costs charged to income:       365 247 1,050 $ 626
Excess tax benefits realized from share options exercised and stock issuance:       0 (3) 634 247
Unrecognized compensation costs       1,563   $ 1,563  
Recognition period for unrecognized compensation cost           1 year 26 days  
Stock options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Excess tax benefits realized from share options exercised and stock issuance:       0 0 $ 0 59
Proceeds from the exercise of stock options and similar instruments:       $ 0 $ 0 $ 0 $ 44
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares 9,352 6,639 12,271        
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   $ 34.36 $ 29.83        
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  
Board Member [Member] | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grant date fair value of equity instruments granted (usd per share) | $ / shares $ 29.17            
Executive Officer [Member] | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares   3,252          
Grant date fair value of equity instruments granted (usd per share) | $ / shares   $ 34.36          
Officer [Member] | Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares 501            
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 $ 27.64            
Officer [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of equity instruments granted (shares) | shares 501            
Grant date fair value of equity instruments granted (usd per share) | $ / shares $ 29.37            
Officer [Member] | Minimum | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target vesting percentage 0.00%            
Officer [Member] | Maximum | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Target vesting percentage 150.00%