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Equity Plans (Details) (USD $) | 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 | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 Incentive Plan [Member] | Sep. 30, 2013 Employee Stock Purchase Plan (ESPP) [Member] | Sep. 30, 2012 Employee Stock Purchase Plan (ESPP) [Member] | Sep. 30, 2013 Employee Stock Purchase Plan (ESPP) [Member] | Sep. 30, 2012 Employee Stock Purchase Plan (ESPP) [Member] | Sep. 30, 2013 Dividend Reinvestment and Stock Purchase Plan (DRSPP) [Member] | Sep. 30, 2012 Dividend Reinvestment and Stock Purchase Plan (DRSPP) [Member] | Sep. 30, 2013 Dividend Reinvestment and Stock Purchase Plan (DRSPP) [Member] | Sep. 30, 2012 Dividend Reinvestment and Stock Purchase Plan (DRSPP) [Member] | Sep. 30, 2013 Restricted Stock and Deferred Restricted Stock [Member] | Sep. 30, 2012 Restricted Stock and Deferred Restricted Stock [Member] | Sep. 30, 2013 Restricted Stock and Deferred Restricted Stock [Member] | Sep. 30, 2012 Restricted Stock and Deferred Restricted Stock [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2012 Stock Options [Member] | Sep. 30, 2013 Stock Options [Member] | Sep. 30, 2012 Stock Options [Member] | Jul. 30, 2013 Restricted Stock Units (RSUs) [Member] vesting_installment | Apr. 24, 2013 Restricted Stock Units (RSUs) [Member] | Jan. 02, 2013 Restricted Stock Units (RSUs) [Member] vesting_installment | Apr. 23, 2013 Common Stock [Member] | Mar. 25, 2013 Common Stock [Member] | Sep. 30, 2013 Dividend Equivalent Rights [Member] | Sep. 30, 2012 Dividend Equivalent Rights [Member] | Sep. 30, 2013 Dividend Equivalent Rights [Member] | Sep. 30, 2012 Dividend Equivalent Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining shares available for issuance under the Incentive Plan |  |  |  |  | 1,160,597 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issuable upon exercise of Incentive Plan awards |  |  |  |  | 315,508 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs charged to income: | $ 197,000 | $ 168,000 | $ 786,000 | $ 451,000 |  | $ 70,000 | $ 55,000 | $ 128,000 | $ 104,000 |  |  |  |  | $ 127,000 | $ 113,000 | $ 658,000 | $ 347,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Excess tax benefits realized from share options exercised and stock issuance | (68,000) | 0 | 27,000 | 43,000 |  |  |  |  |  |  |  |  |  | (95,000) | 0 | 0 | 35,000 | 27,000 | 0 | 27,000 | 8,000 |  |  |  |  |  |  |  |  |
Proceeds from the exercise of stock options and similar instruments | 512,000 | 326,000 | 878,000 | 731,000 |  | 395,000 | 310,000 | 723,000 | 588,000 | 21,000 | 16,000 | 59,000 | 68,000 |  |  |  |  | 96,000 | 0 | 96,000 | 75,000 |  |  |  |  |  |  |  |  |
Unrecognized compensation costs |  |  |  |  |  | 33,000 |  | 33,000 |  |  |  |  |  | 745,000 |  | 745,000 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |
Recognition period for unrecognized compensation cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 5 months 23 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity instruments granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 628 | 2,667 | 23,840 | 3,634 | 3,918 |  |  |  |
Number of equal successive installments for vesting of stock awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |  |  |
Grant date fair value of equity instruments granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.67 | $ 25.58 | $ 25.08 |  |  |  |  |  |
Liability accrued for Dividend Equivalent Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,000 | 32,000 | 97,000 | 98,000
Decrease to retained earnings for compensation cost related to Dividend Equivalent Rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32,000 | 32,000 | 97,000 | 98,000
Purchase price of common stock under ESPP, percent |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of base compensation employees can designate for stock purchases under ESPP |  |  |  |  |  | 10.00% |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance under the plan |  |  |  |  |  | 270,400 |  | 270,400 |  | 3,000,000 |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan expense |  |  |  |  |  | $ 34,000 | $ 17,000 | $ 102,000 | $ 62,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued under the DRSPP |  |  |  |  |  |  |  |  |  | 829 | 636 | 2,273 | 2,834 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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 Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + 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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