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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
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 per share data) |
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2014 |  |  | 1,029,657 |  |  | $ | 36.55 |  |  |  |  |  |  |  |  |
Options granted |  |  | 108,000 |  |  |  | 59.84 |  |  |  |  |  |  |  |  |
Options exercised |  |  | (86,482 | ) |  |  | 24.65 |  |  |  |  |  |  |  |  |
Options canceled, forfeited, or expired |  |  | (22,500 | ) |  |  | 37.14 |  |  |  |  |  |  |  |  |
Outstanding at September 30, 2015 |  |  | 1,028,675 |  |  |  | 39.98 |  |  |  | 8.82 |  |  | $ | 23,782 |
Exercisable at September 30, 2015 |  |  | 474,500 |  |  |  | 32.17 |  |  | 5.28 Yr |  |  | $ | 14,677 |
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, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands) |
Weighted average grant-date fair value per share of options granted |  | $ | 11.89 |  |  | $ | 12.75 |  |  | $ | 11.55 |  |  | $ | 12.57 |
Total intrinsic value of options exercised |  |  | 1,129 |  |  |  | 1,560 |  |  |  | 3,258 |  |  |  | 3,606 |
Cash received from options exercised |  |  | 779 |  |  |  | 1,605 |  |  |  | 2,132 |  |  |  | 3,247 |
Tax benefit realized from options exercised |  |  | 437 |  |  |  | 604 |  |  |  | 1,260 |  |  |  | 1,395 |
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, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands) |
Stock-based compensation expense |  | $ | 489 |  |  | $ | 448 |  |  | $ | 1,243 |  |  | $ | 1,224 |
Tax benefit |  |  | 189 |  |  |  | 173 |  |  |  | 481 |  |  |  | 473 |
Stock-based compensation expense, net of tax |  | $ | 300 |  |  | $ | 275 |  |  | $ | 762 |  |  | $ | 751 |
Remaining Fair Value of Stock Options | The Company will continue to amortize the remaining fair value of stock options over the remaining vesting period of approximately seven years. The following table shows the remaining fair value of stock options:
|  | September 30, 2015 |
|  | (Dollars in thousands) |
Fair value of stock options |  | $ | 4,186 |
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 during the periods presented:
|  | Nine Months Ended September 30,
|  | 2015 |  | 2014
Risk-free interest rate |  | 1.83 to 2.26% |  | 2.50 to 2.54%
Dividend yield |  | 2.00% |  | 2.00%
Stock price volatility |  | 18.23 to 19.65% |  | 18.62 to 18.98%
Expected term |  | 10 Yrs |  | 10 Yrs

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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