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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of stock option activity | The following table summarizes the stock option activity during the periods indicated:
| Shares |  | Weighted-Average Exercise Price
Outstanding at December 31, 2017 | 23,231 |  |  | $ | 14.21 |
Exercised | (9,842) |  |  | 13.45 |
Forfeited or expired | (831) |  |  | 14.77 |
Outstanding at December 31, 2018 | 12,558 |  |  | 14.77 |
Exercised | (3,901) |  |  | 14.77 |
Outstanding at December 31, 2019 | 8,657 |  |  | 14.77 |
Exercised | (8,248) |  |  | 14.77 |
Forfeited or expired | (409) |  |  | 14.77 |
Outstanding, vested and expected to vest and exercisable at December 31, 2020 | — |  |  | $ | — |
Schedule of restricted stock award activity | The following table summarizes the restricted stock award activity for the periods indicated
| Shares |  | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | 137,399 |  |  | $ | 17.00 |
Vested | (67,877) |  |  | 16.74 |
Forfeited | (3,489) |  |  | 16.92 |
Nonvested at December 31, 2018 | 66,033 |  |  | 17.28 |
Vested | (43,148) |  |  | 17.07 |
Forfeited | (2,178) |  |  | 18.32 |
Nonvested at December 31, 2019 | 20,707 |  |  | 17.59 |
Vested | (20,707) |  |  | 17.59 |
Nonvested at December 31, 2020 | — |  |  | $ | — |
Schedule of assumptions of PRSUs granted | The Company used the following assumptions to estimate the fair value of performance-based restricted share units granted for the periods indicated:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Shares issued | 15,200 |  |  | 14,396 |  |  | 11,099 |
Expected Term in Years | 2.8 |  | 2.8 |  | 2.8
Weighted-Average Risk Free Interest Rate | 1.14 | % |  | 2.47 | % |  | 2.39 | %
Weighted Average Fair Value | 23.50 |  |  | 30.06 |  |  | 27.69 |
Correlation coefficient | ABA NASDAQ Community Bank Index |  | ABA NASDAQ Community Bank Index |  | ABA NASDAQ Community Bank Index
Range of peer company volatilities | 18.1%-107.6% |  | 19.9%-75.4% |  | 19.0%-51.4%
Range of peer company correlation coefficients | 16.1%-90.2% |  | 34.5%-90.7% |  | 28.2%-94.3%
Heritage volatility | 23.2 | % |  | 23.9 | % |  | 22.3 | %
Heritage correlation coefficient | 80.5 | % |  | 79.9 | % |  | 76.4 | %
Summary of RSU activity | The following table summarizes the unit activity for the periods indicated:
| Units |  | Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2017 | 90,544 |  |  | $ | 25.31 |
Granted | 125,633 |  |  | 30.62 |
Vested | (32,375) |  |  | 25.44 |
Forfeited | (4,617) |  |  | 27.82 |
Nonvested at December 31, 2018 | 179,185 |  |  | 28.94 |
Granted | 126,598 |  |  | 31.89 |
Vested | (64,173) |  |  | 29.25 |
Forfeited | (8,070) |  |  | 30.25 |
Nonvested at December 31, 2019 | 233,540 |  |  | 30.41 |
Granted | 200,972 |  |  | 23.61 |
Vested | (109,853) |  |  | 29.21 |
Forfeited | (8,543) |  |  | 28.07 |
Nonvested at December 31, 2020 | 316,116 |  |  | $ | 26.57 |

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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