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Stock Options and Stock-Based Compensation - Summary of Restricted Stock Granted (Details) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 1995
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) |  |  |  |  |  | 10 years
Shares | 127,560 |  |  |  |  |
Plan 2010 | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares | 71,086 |  |  |  |  |
Remaining Term (In Years) | 2 years |  |  |  |  |
Plan 2010 | Restricted Stock | One Year |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) | 1 year |  |  |  |  |
Shares | 3,976 |  |  |  |  |
Remaining Term (In Years) | 4 months 24 days |  |  |  |  |
Plan 2010 | Restricted Stock | Five Years |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) | 5 years | 5 years | 5 years | 5 years | 5 years |
Shares | 9,972 | 15,015 | 12,023 | 10,422 | 14,776 |
Remaining Term (In Years) | 4 years 3 months 18 days | 3 years 3 months 18 days | 2 years 3 months 18 days | 1 year 3 months 18 days | 3 months 18 days |
Plan 2010 | Restricted Stock | Three Years [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting Term (In Years) | 3 years |  |  |  |  |
Shares | 4,902 |  |  |  |  |
Remaining Term (In Years) | 2 years 3 months 18 days |  |  |  |  |

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- Definition 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. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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