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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 2,036,298 |  |  | $ | 20.35 |  |  |  |  |  |  |
Options granted |  |  | 60,000 |  |  |  | 29.04 |  |  |  |  |  |  |
Options exercised |  |  | (621,398 | ) |  |  | 15.64 |  |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (60,000 | ) |  |  | 27.94 |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 1,414,900 |  |  |  | 22.46 |  |  | 9.59Yrs |  | $ | 34,049 |
Exercisable at December 31, 2016 |  |  | 650,400 |  |  |  | 18.60 |  |  | 6.78Yrs |  | $ | 18,167 |
Options Granted and Options Exercised Under Stock Option Plan | The following table has additional information regarding options granted and options exercised under both the BancFirst ISOP and the BancFirst Directors’ Stock Option Plan:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands, except per share data) |
Weighted average grant-date fair value per share of options granted |  | $ | 11.87 |  |  | $ | 5.96 |  |  | $ | 5.86 |
Total intrinsic value of options exercised |  |  | 8,389 |  |  |  | 12,230 |  |  |  | 4,376 |
Cash received from options exercised |  |  | 4,660 |  |  |  | 9,720 |  |  |  | 3,212 |
Tax benefit realized from options exercised |  |  | 3,245 |  |  |  | 4,731 |  |  |  | 1,693 |
Stock-based Employee Compensation Expense | The following table is a summary of the Company’s recorded stock-based compensation expense:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 1,180 |  |  | $ | 1,636 |  |  | $ | 1,717 |
Tax benefit |  |  | 301 |  |  |  | 633 |  |  |  | 664 |
Stock-based compensation expense, net of tax |  | $ | 879 |  |  | $ | 1,003 |  |  | $ | 1,053 |
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, 2017 |
|  | (Dollars in thousands) |
Unearned stock-based compensation expense |  | $ | 3,268 |
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Risk-free interest rate |  | 2.15 to 2.40% |  |  | 1.46 to 2.02% |  |  | 1.83 to 2.26% |
Dividend yield |  |  | 2.00 | % |  |  | 2.00 | % |  |  | 2.00 | %
Stock price volatility |  | 22.57 to 24.18% |  |  | 20.41 to 21.78% |  |  | 18.23 to 21.08% |
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, |
|  | 2017 |  |  | 2016 |
Accumulated stock units |  |  | 138,768 |  |  |  | 140,044 |
Average price |  | $ | 22.84 |  |  | $ | 20.87 |

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