Stock Based Compensation (Details) - Employee Stock Option [Member] - $ / shares |
6 Months Ended | 12 Months Ended |
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Jun. 30, 2019 |
Dec. 31, 2018 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Shares - Nonvested, Beginning Balance (in shares) | 27,423 | 30,690 |
| Shares - Granted (in shares) | 7,407 | 4,433 |
| Shares - Vested (in shares) | (4,310) | (7,700) |
| Shares - Nonvested, Ending Balance (in shares) | 30,520 | 27,423 |
| Weighted-Average Grant Date Fair Value - Nonvested, Beginning Balance (in dollars per share) | $ 32.58 | $ 28.51 |
| Weighted-Average Grant Date Fair Value - Granted (in dollars per share) | 43.00 | 43.50 |
| Weighted-Average Grant Date Fair Value - Vested (in dollars per share) | 28.37 | 22.64 |
| Weighted-Average Grant Date Fair Value - Nonvested, Ending Balance (in dollars per share) | $ 35.70 | $ 32.58 |
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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. No definition available.
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- Definition Gross number of share options (or share units) granted during the period. No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of non-vested options outstanding. No definition available.
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- Definition Weighted average grant-date fair value of non-vested options outstanding. No definition available.
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- Definition Number of options vested. No definition available.
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- Definition Weighted average grant-date fair value of options vested. No definition available.
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- Details
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