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Stock-Based Compensation (Schedule of Outstanding Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	219,540	225,670	229,836	207,534
Average Exercise Price	$ 26.64	$ 26.27	$ 25.85	$ 25.93
Remaining Life, Years	4 years 9 months 18 days
Options Exercisable	190,940	196,489	199,005
Average Exercise Price	$ 26.58	$ 26.15	$ 25.99
Average Exercise Price - $27.27 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	15,594
Average Exercise Price	$ 27.27
Remaining Life, Years	1 year
Options Exercisable	15,594
Average Exercise Price	$ 27.27
Average Exercise Price - $27.62 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	20,796
Average Exercise Price	$ 27.62
Remaining Life, Years	2 years 3 months 18 days
Options Exercisable	20,796
Average Exercise Price	$ 27.62
Average Exercise Price - $28.64 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	18,700
Average Exercise Price	$ 28.64
Remaining Life, Years	3 years
Options Exercisable	18,700
Average Exercise Price	$ 28.64
Average Exercise Price - $28.41 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	18,700
Average Exercise Price	$ 28.41
Remaining Life, Years	4 years
Options Exercisable	18,700
Average Exercise Price	$ 28.41
Average Exercise Price - $25.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	19,800
Average Exercise Price	$ 25.00
Remaining Life, Years	5 years
Options Exercisable	19,800
Average Exercise Price	$ 25.00
Average Exercise Price - $26.27 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,100
Average Exercise Price	$ 26.27
Remaining Life, Years	5 years 3 months 18 days
Options Exercisable	1,100
Average Exercise Price	$ 26.27
Average Exercise Price - $25.99 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	18,700
Average Exercise Price	$ 25.99
Remaining Life, Years	6 years
Options Exercisable	18,700
Average Exercise Price	$ 25.99
Average Exercise Price - $24.44 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,100
Average Exercise Price	$ 24.44
Remaining Life, Years	6 years 2 months 12 days
Options Exercisable	1,100
Average Exercise Price	$ 24.44
Average Exercise Price - $25.25 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	23,650
Average Exercise Price	$ 25.25
Remaining Life, Years	7 years
Options Exercisable	23,650
Average Exercise Price	$ 25.25
Average Exercise Price - $24.97 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	25,850
Average Exercise Price	$ 24.97
Remaining Life, Years	8 years
Options Exercisable	25,850
Average Exercise Price	$ 24.97
Average Exercise Price - $27.05 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	26,950
Average Exercise Price	$ 27.05
Remaining Life, Years	9 years
Options Exercisable	26,950
Average Exercise Price	$ 27.05
Average Exercise Price - $27.55 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,100
Average Exercise Price	$ 27.55
Remaining Life, Years	9 years
Average Exercise Price - $28.95 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	2,000
Average Exercise Price	$ 28.95
Remaining Life, Years	9 years 8 months 12 days
Average Exercise Price - $26.90 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	25,500
Average Exercise Price	$ 26.90
Remaining Life, Years	10 years

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ 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



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term for option awards outstanding, 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 (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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