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Stock-Based Compensation (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Restricted Stock |  |  |
Shares |  |  |
Outstanding at the beginning of the period (in shares) | 185,764 | 106,838 | 53,945
Granted (in shares) | 76,590 | 106,289 | 65,285
Vested (in shares) | (48,513) | (25,248) | (11,128)
Forfeited (in shares) | (2,125) | (2,115) | (1,264)
Outstanding unvested at the end of the period (in shares) | 211,716 | 185,764 | 106,838
Weighted-Average Grant Date Fair Value |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 19.54 | $ 21.47 | $ 17.15
Granted (in dollars per share) | $ 24.48 | $ 17.95 | $ 24.23
Vested (in dollars per share) | $ 19.50 | $ 21.07 | $ 17.13
Forfeited (in dollars per share) | $ 20.03 | $ 18.91 | $ 17.74
Outstanding unvested at the end of the period (in dollars per share) | $ 21.33 | $ 19.54 | $ 21.47
Restricted Stock | Various employees | Minimum |  |  |
Additional disclosures |  |  |
Vesting period | 3 years |  |
Restricted Stock | Various employees | Maximum |  |  |
Additional disclosures |  |  |
Vesting period | 5 years |  |
Restricted Stock | Eligible members of the Board of Directors |  |  |
Additional disclosures |  |  |
Vesting period | 3 years |  |
Performance Awards |  |  |
Shares |  |  |
Outstanding at the beginning of the period (in shares) | 74,923 | 74,435 | 40,256
Granted at target (in shares) | 46,106 | 41,755 | 34,179
Earned for performance above target (in shares) | 11,281 |  |
Forfeited for performance below target (in shares) |  | (9,401) |
Vested (in shares) | (45,116) | (30,855) |
Forfeited (in shares) |  | (1,011) |
Outstanding unvested at the end of the period (in shares) | 87,194 | 74,923 | 74,435
Weighted-Average Grant Date Fair Value |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 20.51 | $ 20.39 | $ 17.18
Granted at target (in dollars per share) | $ 24.68 | $ 17.48 | $ 24.18
Earned for performance above target (in dollars per share) | $ 24.18 |  |
Forfeited for performance below target (in dollars per share) |  | $ 17.18 |
Vested (in dollars per share) | $ 24.18 | $ 17.18 |
Forfeited (in dollars per share) |  | $ 19.76 |
Outstanding unvested at the end of the period (in dollars per share) | $ 21.29 | $ 20.51 | $ 20.39
Shares earned by the participants | 45,116 | 30,855 |
Target awards earned during the performance period (as a percent) | 133.30% | 76.60% |
Performance Awards | Minimum |  |  |
Weighted-Average Grant Date Fair Value |  |  |
Potential payout as a percentage of target shares | 50.00% |  |
Performance Awards | Maximum |  |  |
Weighted-Average Grant Date Fair Value |  |  |
Potential payout as a percentage of target shares | 200.00% |  |

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- Definition Represents the number of equity-based payment instruments other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) earned for performance above target during the period. + References No definition available. + Details
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- Definition Represents the weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event for performance below target. + References No definition available. + Details
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- Definition Represents the percentage of target awards earned for the performance period. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + 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)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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