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Stock Based Compensation (Details) - Employee Stock Option [Member] - $ / shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares - Nonvested, Beginning Balance (in shares) | 30,690 | 28,465
Shares - Granted (in shares) | 4,433 | 4,575
Shares - Vested (in shares) | (6,200) | (1,625)
Shares - Forfeited (in shares) | 0 | (725)
Shares - Nonvested, Ending Balance (in shares) | 28,923 | 30,690
Weighted-Average Grant Date Fair Value - Nonvested, Beginning Balance (in dollars per share) | $ 28.51 | $ 26.67
Weighted-Average Grant Date Fair Value - Granted (in dollars per share) | 43.5 | 39
Weighted-Average Grant Date Fair Value - Vested (in dollars per share) | 22.43 | 25.81
Weighted-Average Grant Date Fair Value - Forfeited (in dollars per share) |  | 28.62
Weighted-Average Grant Date Fair Value - Nonvested, Ending Balance (in dollars per share) | $ 32.11 | $ 28.51

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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