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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Stock-Based Compensation Expense | The amount that we recognized in stock-based compensation expense related to the issuance of stock options and RSUs is presented in the following table:
(Dollars in thousands) |  | 2021 |  | 2020 |  | 2019
Stock options |  | $ | 832 |  |  | $ | 950 |  |  | $ | 873 |
RSUs |  | 1,802 |  |  | 1,403 |  |  | 886 |
Total stock-based compensation expense |  | $ | 2,634 |  |  | $ | 2,353 |  |  | $ | 1,759 |
Stock Option Activity | The following summarizes stock options as of and for the year ended December 31, 2021:
|  | 2021 |  |
|  | Number of Shares |  | Weighted-Average Exercise Price |  |  |  |
Outstanding at beginning of year |  | 1,396,794 |  |  | $ | 15.36 |  |  |  |  |
Granted |  | 43,908 |  |  | 38.82 |  |  |  |  |
Exercised |  | (316,682) |  |  | 15.59 |  |  |  |  |
Forfeited |  | (6,660) |  |  | 15.47 |  |  |  |  |
Expired |  | (3,160) |  |  | 12.82 |  |  |  |  |
Outstanding at end of year |  | 1,114,200 |  |  | $ | 15.86 |  |  |  |  |
Exercisable at end of year |  | 822,063 |  |  | $ | 14.52 |  |  |  |  |
Weighted-average fair value of options granted during 2021 |  |  |  | $ | 10.61 |  |  |  |  |
Weighted-average fair value of options granted during 2020 |  |  |  | $ | 4.48 |  |  |  |  |
Weighted-average fair value of options granted during 2019 |  |  |  | $ | 4.22 |  |  |  |  |
Schedule of Stock Option Valuation Assumptions | The fair value for the options was estimated at the grant date using a Black-Scholes option-pricing model with the following inputs:
|  | 2021 |  | 2020 |  | 2019
Average risk-free interest rates |  | 1.27 | % |  | 0.66 | % |  | 2.02 | %
Weighted-average life (years) |  | 7 |  | 7 |  | 7
Expected volatility |  | 41.2 | % |  | 30.9 | % |  | 21.8 | %
Expected dividend yield |  | 1.08 | % |  | 2.20 | % |  | 0.84 | %
Outstanding and Exercisable Options Information | The following summarizes information related to the total outstanding and exercisable stock options at December 31, 2021:
Options Outstanding |  | Options Exercisable
Total Options |  | Weighted-Average Exercise Price |  | Intrinsic Value (in millions) |  | Weighted-Average Remaining Life |  | Total Options |  | Weighted-Average Exercise Price |  | Intrinsic Value (in millions) |  | Weighted-Average Remaining Life
1,114,200 |  | $15.86 |  | $28.6 |  | 4.98 |  | 822,063 |  | $14.52 |  | $22.2 |  | 4.17
Summary of RSUs | A summary of the activity for our RSUs for the period indicated is presented in the following table:
|  | 2021 |  |
|  | Shares |  | Weighted-Average Grant Date Fair Value |  |  |  |
Balance at beginning of year |  | 253,036 |  |  | $ | 14.70 |  |  |  |  |
Granted |  | 66,872 |  |  | 40.95 |  |  |  |  |
Vested |  | (77,050) |  |  | 14.79 |  |  |  |  |
Forfeited |  | (952) |  |  | 32.38 |  |  |  |  |
Balance at end of year |  | 241,906 |  |  | $ | 21.46 |  |  |  |  |
Weighted-average fair value of RSUs granted during 2021 |  |  |  | $ | 40.95 |  |  |  |  |
Weighted-average fair value of RSUs granted during 2020 |  |  |  | $ | 13.08 |  |  |  |  |
Weighted-average fair value of RSUs granted during 2019 |  |  |  | $ | 15.50 |  |  |  |  |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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