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Incentive Compensation Plan (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [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 2020, 2019 and 2018 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
February 20, 2020 | 95,300 |  | $ | 13.72 |  | February 20, 2023 | 1
February 21, 2019 | 63,000 |  | 14.22 |  | February 22, 2022 | 1
February 21, 2019 | 15,000 |  | 14.22 |  | February 22, 2022 | 1
November 26, 2018 | 2,000 |  | 13.82 |  | November 26, 2021 | 1
May 29, 2018 | 3,000 |  | 15.44 |  | May 29, 2021 | 1
March 26, 2018 | 2,000 |  | 14.08 |  | March 26, 2021 | 1
February 26, 2018 | 77,500 |  | 14.49 |  | February 26, 2021 | 1
March 24, 2017 | 5,000 |  | 12.99 |  | March 24, 2020 | 1
March 24, 2017 | 7,000 |  | 12.99 |  | March 24, 2020 | 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
June 26, 2015 | 1,000 |  | 9.84 |  | June 26, 2018 | 1
February 5, 2015 | 50,000 |  | 8.55 |  | February 5, 2018 | 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:
| 2020 |  | 2019 |  | 2018
| 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 | 171,500 |  |  | $ | 14.27 |  |  | 137,500 |  |  | $ | 13.05 |  |  | 117,000 |  |  | $ | 9.99 |
Granted | 95,300 |  |  | 13.72 |  |  | 78,000 |  |  | 14.22 |  |  | 84,500 |  |  | 14.50 |
Vested | (12,000) |  |  | — |  |  | (41,000) |  |  | 10.09 |  |  | (54,000) |  |  | 9.37 |
Forfeited | (4,000) |  |  | 13.85 |  |  | (3,000) |  |  | 14.40 |  |  | (10,000) |  |  | 9.34 |
Outstanding, end of the year | 250,800 |  |  | 14.13 |  |  | 171,500 |  |  | 14.27 |  |  | 137,500 |  |  | 13.05 |
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 2020, 2019 and 2018. 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
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
February 22, 2018 | 102,000 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2020
February 21, 2019 | 121,900 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2021
February 20, 2020 | 188,700 |  | 3 | 40 | % | 100 | % | 200 | % | — | % | 0 | December 31, 2022
Unvested Target Award | The following table summarizes the estimated unvested target share awards for the Plans as of December 31:
| 2020 |  | 2019 |  | 2018
Outstanding, beginning of the year | 442,832 |  |  |  |  | 496,603 |  |  |  |  | 525,045 |  |  |
Granted | 188,700 |  |  |  |  | 134,929 |  |  |  |  | 130,995 |  |  |
Issued | (134,452) |  |  |  |  | (188,700) |  |  |  |  | (149,480) |  |  |
Forfeited | — |  |  |  |  | — |  |  |  |  | (9,957) |  |  |
Outstanding, end of the year | 497,080 |  |  |  |  | 442,832 |  |  |  |  | 496,603 |  |  |

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