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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Changes in Company's Nonvested Restricted Stock Awards | A summary of changes in the Company’s nonvested Restricted Stock Awards (“RSAs”) under the Omnibus Incentive Plan for the year ended December 31, 2017 were as follows:
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
Nonvested RSAs |  | Shares |  |  | Fair Value |
Nonvested at January 1, 2017 |  |  | 126,644 |  |  | $ | 14.92 |
Granted |  |  | 45,732 |  |  |  | 25.80 |
Vested |  |  | (67,964 | ) |  |  | 16.50 |
Forfeited |  |  | (1,636 | ) |  |  | 16.61 |
Nonvested at December 31, 2017 |  |  | 102,776 |  |  | $ | 18.68 |
Summary of Changes in Company's Stock Options | A summary of changes in the Company’s stock options under the Omnibus Incentive Plan for the year ended December 31, 2017 were as follows:
|  |  |  |  |  |  |  |  |  | Weighted Average |  |  |  |  |
|  |  |  |  |  |  |  |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Weighted Average |  |  | Contractual Term |  |  | Intrinsic Value |
Stock Options |  | Shares |  |  | Exercise Price |  |  | (In Years) |  |  | (In Thousands) |
Outstanding at January 1, 2017 |  |  | 163,661 |  |  | $ | 15.87 |  |  |  |  |  |  |  |  |
Granted |  |  | 58,729 |  |  |  | 25.80 |  |  |  |  |  |  |  |  |
Exercised |  |  | (34,977 | ) |  |  | 15.87 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (2,085 | ) |  |  | 19.69 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 185,328 |  |  | $ | 18.97 |  |  | $ | 8.57 |  |  | $ | 2,321 |
Fully vested shares and shares expected to vest at December 31, 2017 |  |  | 185,328 |  |  | $ | 18.97 |  |  |  | 8.57 |  |  | $ | 2,321 |
Shares exercisable at December 31, 2017 |  |  | 31,742 |  |  | $ | 15.87 |  |  | $ | 8.25 |  |  | $ | 496 |
Schedule of Information Related to Stock Options |
|  | Year Ended December 31, |
(Dollars in thousands, except per share amounts) |  | 2017 |  |  | 2016 |
Aggregate intrinsic value of options exercised |  | $ | 251 |  |  | $ | — |
Cash received from option exercises |  | $ | 283 |  |  | $ | — |
Tax benefit realized from option exercises |  | $ | 88 |  |  | $ | — |
Weighted average fair value of options granted |  | $ | 8.71 |  |  | $ | 5.85 |
Fair Value of Stock Options Granted Weighted-Average Assumptions | The fair value of the stock options granted was determined using the following weighted average assumptions:
|  | 2017 |  |  | 2016 |
Risk-free interest rate |  |  | 2.11 | % |  |  | 1.49 | %
Expected term |  | 6.25 Years |  |  | 6.25 Years |
Expected stock price volatility |  |  | 29.70 | % |  |  | 34.96 | %
Dividend yield |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of cash received from exercise of stock options and similar instruments granted under share-based payment arrangements and tax benefit from exercise of stock options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock shares. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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