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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
	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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Increase (decrease) in liability for stock compensation recorded against retained earnings for dividend equivalent rights.

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Number of Equal Successive Installments for Vesting of Stock Awards

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Number of shares reserved for issuance under equity instrument agreements awarded that validly exist and are outstanding, including vested instruments.

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Increase (decrease) in retained earnings for stock compensation accrued as a liability for dividend equivalent rights.

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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.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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.

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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.

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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).

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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).

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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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).

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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.

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Purchase price of common stock expressed as a percentage of its fair value.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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