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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% |  |  |  |  |  |

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- Definition Number of shares issued during the period from a dividend reinvestment and stock purchase plan (DRSPP). A dividend reinvestment and stock purchase plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity and to purchase additional shares. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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