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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 + Details
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- Definition 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 + Details
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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 Reference 2: 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)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 + Details
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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 + Details
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