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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summary of Activity Under Stock Option Plan | The following table is a summary of the activity under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan:
|  |  |  |  |  |  |  |  |  | Wgtd. Avg. |  |  |  |
|  |  |  |  |  | Wgtd. Avg. |  |  | Remaining |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Contractual |  | Intrinsic |
|  | Options |  |  | Price |  |  | Term |  | Value |
|  | (Dollars in thousands, except option data) |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 1,273,625 |  |  | $ | 25.90 |  |  |  |  |  |  |
Options granted |  |  | 72,000 |  |  |  | 56.47 |  |  |  |  |  |  |
Options exercised |  |  | (123,925 | ) |  |  | 17.42 |  |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (5,000 | ) |  |  | 48.02 |  |  |  |  |  |  |
Outstanding at December 31, 2018 |  |  | 1,216,700 |  |  |  | 28.48 |  |  | 9.53Yrs |  | $ | 26,066 |
Exercisable at December 31, 2018 |  |  | 601,700 |  |  |  | 21.53 |  |  | 7.12Yrs |  | $ | 17,070 |
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 1,414,900 |  |  | $ | 22.46 |  |  |  |  |  |  |
Options granted |  |  | 121,500 |  |  |  | 48.26 |  |  |  |  |  |  |
Options exercised |  |  | (262,775 | ) |  |  | 17.73 |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 1,273,625 |  |  |  | 25.90 |  |  | 9.73Yrs |  | $ | 32,165 |
Exercisable at December 31, 2017 |  |  | 566,625 |  |  |  | 20.07 |  |  | 6.92Yrs |  | $ | 17,611 |
Options Exercised Under Stock Option Plan | The following table has additional information regarding options exercised under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Total intrinsic value of options exercised |  | $ | 4,810 |  |  | $ | 8,389 |  |  | $ | 12,230 |
Cash received from options exercised |  |  | 2,159 |  |  |  | 4,660 |  |  |  | 9,720 |
Tax benefit realized from options exercised |  |  | 1,225 |  |  |  | 3,245 |  |  |  | 4,731 |
Stock-based Employee Compensation Expense | The following table is a summary of the Company’s recorded stock-based compensation expense:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 206 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 1,352 |  |  | $ | 1,180 |  |  | $ | 1,636 |
Tax benefit |  |  | 345 |  |  |  | 301 |  |  |  | 633 |
Stock-based compensation expense, net of tax |  | $ | 1,007 |  |  | $ | 879 |  |  | $ | 1,003 |
Unearned Stock-based Compensation Expense | The Company will continue to amortize the unearned stock-based compensation expense over the remaining vesting period of approximately seven years. The following table shows the unearned stock-based compensation expense:
|  | December 31, 2018 |
|  | (Dollars in thousands) |
Unearned stock-based compensation expense |  | $ | 3,319 |
Assumptions Used for Computing Stock-Based Compensation Expense | The following table shows the assumptions used for computing stock-based compensation expense under the fair value method on options granted during the periods presented:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted average grant-date fair value per share of options granted |  | $ | 14.71 |  |  | $ | 11.87 |  |  | $ | 5.96 |
Risk-free interest rate |  | 2.55 to 3.05% |  |  | 2.15 to 2.40% |  |  | 1.46 to 2.02% |
Dividend yield |  |  | 2.00 | % |  |  | 2.00 | % |  |  | 2.00 | %
Stock price volatility |  | 23.05 to 23.95% |  |  | 22.57 to 24.18% |  |  | 20.41 to 21.78% |
Expected term |  | 10 Yrs |  |  | 10 Yrs |  |  | 10 Yrs |
Summary of Accumulated Stock Units | A summary of the accumulated stock units is as follows:
|  | December 31, |
|  | 2018 |  |  | 2017 |
Accumulated stock units |  |  | 143,347 |  |  |  | 138,768 |
Average price |  | $ | 24.91 |  |  | $ | 22.84 |

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