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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Changes in Nonvested Restricted Stock Awards | A summary of changes in nonvested restricted stock awards follows:
|  | Shares |  |  | Weighted-average Grant Date Fair Value |
Nonvested at January 1, 2017 |  |  | 100,726 |  |  |  | $17.36 |
Granted |  |  | 39,673 |  |  |  | 25.94 |
Forfeited |  |  | (2,482 | ) |  |  | 21.12 |
Vested |  |  | (43,445 | ) |  |  | 17.54 |
Nonvested at December 31, 2017 |  |  | 94,472 |  |  |  | $20.79 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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