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Share-based Compensation - Restricted and Deferred Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 25, 2019 | Jul. 05, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Shares |  |  |  |  |
Forfeited (in shares) |  |  | (1,580) |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |
Forfeited (in dollars per share) |  |  | $ 31.44 |  |
Additional disclosures |  |  |  |  |
Compensation expense recognized |  |  | $ 3.8 | $ 3.5 | $ 2.6
Amount of compensation cost to be recognized |  |  | $ 12.2 |  |
Period over which cost will be recognized |  |  | 3 years 6 months |  |
Restricted stock unit |  |  |  |  |
Shares |  |  |  |  |
Non-vested at beginning of year (in shares) |  |  | 690,495 |  |
Granted (in shares) |  |  | 216,411 |  |
Dividend equivalents earned (in shares) |  |  | 24,127 |  |
Vested (in shares) |  |  | (107,537) |  |
Forfeited (in shares) |  |  | (45,179) |  |
Non-vested at end of year (in shares) |  |  | 778,317 | 690,495 |
Weighted-Average Grant Date Fair Value |  |  |  |  |
Non-vested at beginning of year (in dollars per share) |  |  | $ 26.14 |  |
Granted (in dollars per share) |  |  | 26.73 |  |
Dividend equivalents earned (in dollars per share) |  |  | 26.07 |  |
Vested (in dollars per share) |  |  | 18.54 |  |
Forfeited (in dollars per share) |  |  | 27.48 |  |
Non-vested at end of year (in dollars per share) |  |  | $ 27.27 | $ 26.14 |
Additional disclosures |  |  |  |  |
Stock Issued During Period Shares Equity Instruments Other than Options Vested and Related Tax Benefit |  |  | 92,996 |  |
Restricted stock unit | Members of management |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) | 11,592 |  |  |  |
Stock price (in dollars per share) | $ 25.88 | $ 26.78 |  |  |
Additional disclosures |  |  |  |  |
Compensation expense recognized | $ 0.3 | $ 5.3 |  |  |
Period over which cost will be recognized | 3 years | 5 years |  |  |
Vesting percentage (as a percent) | 100.00% | 100.00% |  |  |
Deferred stock units |  |  |  |  |
Shares |  |  |  |  |
Non-vested at beginning of year (in shares) |  |  | 20,449 |  |
Granted (in shares) |  |  | 20,984 |  |
Dividend equivalents earned (in shares) |  |  | 2,685 |  |
Vested (in shares) |  |  | (21,277) |  |
Non-vested at end of year (in shares) |  |  | 21,261 | 20,449 |
Outstanding at end of year (in shares) |  |  | 90,497 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |
Non-vested at beginning of year (in dollars per share) |  |  | $ 27.93 |  |
Granted (in dollars per share) |  |  | 26.78 |  |
Dividend equivalents earned (in dollars per share) |  |  | 26.06 |  |
Vested (in dollars per share) |  |  | 31.05 |  |
Non-vested at end of year (in dollars per share) |  |  | 23.18 | $ 27.93 |
Outstanding at end of year (in dollars per share) |  |  | $ 23.38 |  |
Deferred stock units | Directors |  |  |  |  |
Shares |  |  |  |  |
Stock price (in dollars per share) |  | $ 26.78 |  |  |
Additional disclosures |  |  |  |  |
Amount of compensation cost to be recognized |  | $ 0.6 |  |  |
Period over which cost will be recognized |  | 1 year |  |  |
Stock option awards |  |  |  |  |
Additional disclosures |  |  |  |  |
Compensation expense recognized |  |  | $ 0.1 | $ 0.2 |
First Community 2016 Equity Incentive Plan | Restricted stock unit | Members of management |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) |  | 10,644 |  |  |
First Community 2016 Equity Incentive Plan | Deferred stock units | Directors |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) |  | 1,867 |  |  |
2010 Equity Incentive Plan | Restricted stock unit | Members of management |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) |  | 185,400 |  |  |
2010 Equity Incentive Plan | Restricted stock unit | Chairman |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) |  | 8,775 |  |  |
Stock price (in dollars per share) |  | $ 26.78 |  |  |
Additional disclosures |  |  |  |  |
Compensation expense recognized |  | $ 0.2 |  |  |
Period over which cost will be recognized |  | 5 years |  |  |
Vesting percentage (as a percent) |  | 100.00% |  |  |
2010 Equity Incentive Plan | Deferred stock units |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) |  | 1,568 |  |  |
2010 Equity Incentive Plan | Deferred stock units | Directors |  |  |  |  |
Shares |  |  |  |  |
Granted (in shares) |  | 17,549 |  |  |

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