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Incentive Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | The following provides detail on the restricted stock awards which were issued and outstanding in 2017, 2016 and 2015 in order to retain and attract key employees. The grant date fair value of the restricted stock awards is equal to the price of First Commonwealth’s common stock on grant date.
Grant Date | Shares issued | Grant Price | Vesting Date | Number of Equal Vesting Periods
March 24, 2017 | 5,000 |  | $ | 12.99 |  | March 24, 2020 | 1
March 24, 2017 | 7,000 |  | 12.99 |  | August 31, 2017 | 1
March 24, 2017 | 7,000 |  | 12.99 |  | March 24, 2020 | 1
March 24, 2017 | 7,000 |  | 12.99 |  | August 31, 2017 | 1
December 19, 2016 | 15,000 |  | 13.96 |  | December 19, 2019 | 3
September 30, 2016 | 10,000 |  | 10.09 |  | September 30, 2019 | 1
September 19, 2016 | 33,000 |  | 10.02 |  | September 19, 2019 | 3
June 7, 2016 | 10,000 |  | 9.34 |  | June 7, 2019 | 1
March 1, 2016 | 10,000 |  | 8.84 |  | March 1, 2019 | 1
March 1, 2016 | 5,000 |  | 8.84 |  | March 1, 2019 | 1
March 1, 2016 | 20,000 |  | 8.84 |  | August 31, 2017 | 1
February 18, 2016 | 18,348 |  | 8.43 |  | December 31, 2016 | 1
June 26, 2015 | 1,000 |  | 9.84 |  | June 26, 2018 | 1
February 20, 2015 | 10,000 |  | 8.45 |  | August 31, 2017 | 1
February 20, 2015 | 34,200 |  | 8.45 |  | December 31, 2015 | 1
February 5, 2015 | 50,000 |  | 8.55 |  | February 5, 2018 | 1
January 29, 2015 | 20,170 |  | 7.93 |  | December 31, 2015 | 1
January 15, 2015 | 20,000 |  | 8.38 |  | January 15, 2017 | 1
November 17, 2014 | 3,500 |  | 9.26 |  | November 17, 2017 | 1
April 8, 2014 | 27,500 |  | 8.89 |  | April 8, 2017 | 3
March 24, 2014 | 46,000 |  | 9.18 |  | March 24, 2017 | 1
March 4, 2014 | 5,000 |  | 8.75 |  | March 4, 2017 | 1
January 1, 2014 | 12,626 |  | 8.82 |  | December 31, 2014 | 1
August 16, 2013 | 3,000 |  | 7.57 |  | August 16, 2016 | 1
May 31, 2013 | 45,000 |  | 7.21 |  | May 31, 2016 | 3
March 1, 2013 | 10,000 |  | 7.35 |  | March 1, 2016 | 1
February 24, 2012 | 34,000 |  | 5.96 |  | December 31, 2014 | 1
February 24, 2012 | 90,000 |  | 5.96 |  | February 24, 2015 | 1
January 1, 2012 | 100,000 |  | 5.26 |  | January 1, 2016 | 4
November 21, 2011 | 10,000 |  | 4.41 |  | November 21, 2014 | 1
April 1, 2011 | 25,000 |  | 6.82 |  | April 1, 2016 | 1
Unvested Service-Based Restricted Stock Awards | A summary of the status of First Commonwealth’s unvested service-based restricted stock awards as of December 31 and changes for the years ended on those dates is presented below:
| 2017 |  | 2016 |  | 2015
| Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value |  | Shares |  | Weighted Average Grant Date Fair Value
Outstanding, beginning of the year | 247,668 |  |  | $ | 9.34 |  |  | 231,834 |  |  | $ | 8.01 |  |  | 265,000 |  |  | $ | 7.08 |
Granted | 26,000 |  |  | 12.99 |  |  | 121,348 |  |  | 9.88 |  |  | 135,370 |  |  | 8.41 |
Vested | (151,668 | ) |  | 9.49 |  |  | (105,514 | ) |  | 7.04 |  |  | (168,536 | ) |  | 6.87 |
Forfeited | (5,000 | ) |  | 8.55 |  |  | — |  |  | — |  |  | — |  |  | — |
Outstanding, end of the year | 117,000 |  |  | 9.99 |  |  | 247,668 |  |  | 9.34 |  |  | 231,834 |  |  | 8.01 |
Schedule of Restricted Stock Units Granted Based on Performance [Table Text Block] | The following provides detail on restricted stock awards estimated to be granted on a performance award basis during 2017, 2016 and 2015. These plans were previously approved by the Board of Directors.
Grant Date | Target Share Award | Performance Period (years) | Award if threshold met | Award if targets are met | Award if superior met | Award if threshold not achieved | Vesting After Performance Period (years) | Final vesting
February 24, 2012 | 68,000 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 1 | December 31, 2015
January 28, 2013 | 128,611 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 1 | December 31, 2016
January 27, 2014 | 125,000 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2016
January 26, 2015 | 125,000 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2017
December 30, 2015 | 60,000 |  | 5 |  |  |  |  | 0 | December 31, 2020
February 18, 2016 | 160,650 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2018
February 23, 2017 | 93,500 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2019
Unvested Target Award | The following table summarizes the estimated unvested target share awards for the Plans as of December 31:
| 2017 |  | 2016 |  | 2015
Outstanding, beginning of the year | 426,596 |  |  | 320,705 |  |  | 284,000 |
Granted | 276,442 |  |  | 176,936 |  |  | 185,000 |
Issued | (171,637 | ) |  | (18,348 | ) |  | (34,200 | )
Forfeited | (6,356 | ) |  | (52,697 | ) |  | (114,095 | )
Outstanding, end of the year | 525,045 |  |  | 426,596 |  |  | 320,705 |
Outstanding Stock Options |

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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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