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Equity Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended |  |  | 0 Months Ended
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Aug. 04, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Incentive Plan | Sep. 30, 2014 Employee Stock Purchase Plan (ESPP) | Sep. 30, 2013 Employee Stock Purchase Plan (ESPP) | Sep. 30, 2014 Employee Stock Purchase Plan (ESPP) | Sep. 30, 2013 Employee Stock Purchase Plan (ESPP) | Sep. 30, 2014 Dividend Reinvestment and Stock Purchase Plan (DRSPP) | Sep. 30, 2013 Dividend Reinvestment and Stock Purchase Plan (DRSPP) | Sep. 30, 2014 Dividend Reinvestment and Stock Purchase Plan (DRSPP) | Sep. 30, 2013 Dividend Reinvestment and Stock Purchase Plan (DRSPP) | Sep. 30, 2014 Restricted stock and deferred restricted stock | Sep. 30, 2013 Restricted stock and deferred restricted stock | Sep. 30, 2014 Restricted stock and deferred restricted stock | Sep. 30, 2013 Restricted stock and deferred restricted stock | Sep. 30, 2014 Stock options | Sep. 30, 2013 Stock options | Sep. 30, 2014 Stock options | Sep. 30, 2013 Stock options | Aug. 04, 2014 Restricted Stock Units (RSUs) | Apr. 30, 2014 Restricted Stock Units (RSUs) | Jan. 31, 2014 Restricted Stock Units (RSUs) | Jan. 02, 2014 Restricted Stock Units (RSUs) vesting_installment | Sep. 30, 2014 Restricted Stock Units (RSUs) vesting_installment | Aug. 04, 2014 Performance Shares | Sep. 30, 2014 Common Stock Employee Stock Purchase Plan (ESPP) | Apr. 14, 2014 Common Stock | Aug. 04, 2014 Minimum | Aug. 04, 2014 Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares available for issuance under the Incentive Plan (shares) |  |  |  |  |  | 1,073,817 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon exercise of Incentive Plan awards (shares) |  |  |  |  |  | 346,296 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs charged to income: |  | $ 323 | $ 197 | $ 774 | $ 786 |  | $ 76 | $ 70 | $ 148 | $ 128 |  |  |  |  | $ 247 | $ 127 | $ 626 | $ 658 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefits realized from share options exercised and stock issuance: |  | (3) | (68) | 306 | 27 |  |  |  |  |  |  |  |  |  | (3) | (95) | 247 | 0 | 0 | 27 | 59 | 27 |  |  |  |  |  |  |  |  |  |
Proceeds from the exercise of stock options and similar instruments: |  | 433 | 512 | 917 | 878 |  | 433 | 395 | 839 | 723 | 0 | 21 | 34 | 59 |  |  |  |  | 0 | 96 | 44 | 96 |  |  |  |  |  |  |  |  |  |
Number of equity instruments granted (shares) | 36,988 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,071 | 9,002 | 3,845 | 21,790 |  | 19,917 |  |  |  |
Number of equal successive installments for vesting of stock awards (vesting installments) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |
Grant date fair value of equity instruments granted (usd per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24.14 | $ 26.48 | $ 26.39 | $ 26.80 |  | $ 26.81 |  |  |  |
Target vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 200.00%
Unrecognized compensation costs |  |  |  |  |  |  | 48 |  | 48 |  |  |  |  |  | 1,863 |  | 1,863 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition period for unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 6 months 29 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance under the plan (shares) |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |
Plan expense |  |  |  |  |  |  | $ 37 | $ 34 | $ 112 | $ 102 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued under the DRSPP (shares) |  |  |  |  |  |  |  |  |  |  | 0 | 829 | 1,151 | 2,273 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Deregistered (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,993,744 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 weighted average fair value at grant date for nonvested equity-based awards issued 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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -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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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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