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Stock Option And Stock Award Plans (Summary Of Additional Information On Non-Vested Restricted Stock Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value, Vested	$ (2,100)	$ (1,900)	$ (1,900)
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance	126,150	93,850	45,750
Number of Shares, Granted	94,949	51,360	56,717
Number of Shares, Vested	(60,357)	(18,060)	(8,284)
Number of Shares, Forfeited	(16,842)	(1,000)	(333)
Number of Shares, Outstanding, Ending Balance	143,900	126,150	93,850
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance	$ 18.25	$ 17.40	$ 17.70
Wgtd. Ave. Grant Date Fair Value/Sh., Granted	$ 19.06	$ 19.42	$ 17.23
Wgtd. Ave. Grant Date Fair Value/Sh., Vested	$ 18.01	$ 17.20	$ 17.84
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited	$ 18.82	$ 17.13	$ 18.12
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance	$ 18.82	$ 18.25	$ 17.40
Grant Date Fair Value, Outstanding, Beginning Balance	2,302	1,633	810
Grant Date Fair Value, Granted	1,810	997	977
Grant Date Fair Value, Vested	(1,087)	(311)	(148)
Grant Date Fair Value, Forfeited	(317)	(17)	(6)
Grant Date Fair Value, Outstanding, Ending Balance	2,708	2,302	1,633
Maximum Non-Vested Restricted Stock Units Issuable Upon Satisfaction Of Certain Performance Criteria [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance	85,000	150,925	72,175
Number of Shares, Granted	87,200	88,900	82,750
Number of Shares, Vested		(66,925)
Number of Shares, Forfeited	(80,400)	(87,900)	(4,000)
Number of Shares, Outstanding, Ending Balance	91,800	85,000	150,925
Wgtd. Ave. Grant Date Fair Value/Sh., Beginning Balance	$ 19.35	$ 17.21	$ 17.64
Wgtd. Ave. Grant Date Fair Value/Sh., Granted	$ 18.79	$ 19.32	$ 16.83
Wgtd. Ave. Grant Date Fair Value/Sh., Vested		$ 17.68
Wgtd. Ave. Grant Date Fair Value/Sh., Forfeited	$ 19.31	$ 16.93	$ 17.10
Wgtd. Ave. Grant Date Fair Value/Sh., Ending Balance	$ 18.85	$ 19.35	$ 17.21
Grant Date Fair Value, Outstanding, Beginning Balance	1,645	2,598	1,273
Grant Date Fair Value, Granted	1,638	1,718	1,393
Grant Date Fair Value, Vested		(1,183)
Grant Date Fair Value, Forfeited	(1,553)	(1,488)	(68)
Grant Date Fair Value, Outstanding, Ending Balance	$ 1,730	$ 1,645	$ 2,598

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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