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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 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) |
Nine Months Ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 1,273,625 |  |  | $ | 25.90 |  |  |  |  |  |  |
Options granted |  |  | 57,000 |  |  |  | 57.71 |  |  |  |  |  |  |
Options exercised |  |  | (118,425 | ) |  |  | 17.37 |  |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (5,000 | ) |  |  | 48.02 |  |  |  |  |  |  |
Outstanding at September 30, 2018 |  |  | 1,207,200 |  |  |  | 28.14 |  |  | 9.70 Yrs |  | $ | 38,399 |
Exercisable at September 30, 2018 |  |  | 530,200 |  |  |  | 21.15 |  |  | 7.05 Yrs |  | $ | 20,574 |
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:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  | (Dollars in thousands except per share data) |
Weighted average grant-date fair value per share of options granted |  | $ | 16.49 |  |  | $ | 11.63 |  |  | $ | 14.93 |  |  | $ | 11.21 |
Total intrinsic value of options exercised |  |  | 766 |  |  |  | 1,493 |  |  |  | 4,593 |  |  |  | 7,138 |
Cash received from options exercised |  |  | 413 |  |  |  | 856 |  |  |  | 2,057 |  |  |  | 4,113 |
Tax benefit realized from options exercised |  |  | 195 |  |  |  | 578 |  |  |  | 1,170 |  |  |  | 2,761 |
Stock-based Employee Compensation Expense | The following table is a summary of the Company’s recorded stock-based compensation expense:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 353 |  |  | $ | 354 |  |  | $ | 981 |  |  | $ | 819 |
Tax benefit |  |  | 90 |  |  |  | 137 |  |  |  | 250 |  |  |  | 317 |
Stock-based compensation expense, net of tax |  | $ | 263 |  |  | $ | 217 |  |  | $ | 731 |  |  | $ | 502 |
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:
|  | September 30, 2018 |
|  | (Dollars in thousands) |
Unearned stock-based compensation expense |  | $ | 3,350 |
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:
|  | Nine Months Ended September 30,
|  | 2018 |  | 2017
Risk-free interest rate |  | 2.55 to 3.05% |  | 2.15 to 2.38%
Dividend yield |  | 2.00% |  | 2.00%
Stock price volatility |  | 23.05 to 23.46% |  | 22.57 to 23.53%
Expected term |  | 10 Yrs |  | 10 Yrs
Summary of Accumulated Stock Units | A summary of the accumulated stock units is as follows:
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Accumulated stock units |  |  | 140,946 |  |  |  | 138,768 |
Average price |  | $ | 24.36 |  |  | $ | 22.84 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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