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Stock-Based Compensation - Additional Information (Detail) | 9 Months Ended
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Sep. 30, 2017 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Deferred board fees percentage for stock units accumulation | 100.00%
Nonqualified Incentive Stock Option Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Vesting period in years | 7 years
Nonqualified Incentive Stock Option Plan [Member] | Stock Option [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of shares to be issued under incentive stock option plan | 6,400,000
Shares for future grants | 371,470
Stock option plan termination date | Dec. 31, 2019
Option exercisable rate | 25.00%
Option exercisable period | 4 years
Options expire period | 15 years
Vesting period in years, start | 4 years
Share based compensation options exercisable period | 2024
Options vest and exercisable Description | The options are exercisable beginning four years from the date of grant at the rate of 25% per year for four years. Options expire at the end of fifteen years from the date of grant
Nonqualified Incentive Stock Option Plan [Member] | Stock Option [Member] | Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock price percentage to fair value at grant date | 100.00%
Non-Employee Directors Stock Option Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of shares to be issued under incentive stock option plan | 520,000
Shares for future grants | 60,000
Option exercisable rate | 25.00%
Option exercisable period | 1 year
Options expire period | 15 years
Share based compensation options exercisable period | 2021
Options vest and exercisable Description | The options are exercisable beginning one year from the date of grant at the rate of 25% per year for four years
Vesting period in years | 4 years
Number of options granted for non-employee director | 10,000
Non-Employee Directors Stock Option Plan [Member] | Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Stock price percentage to fair value at grant date | 100.00%
Banc First Deferred Stock Compensation Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Number of shares authorized for issuance under deferred compensation plan | 222,220
Number of shares of common stock distributed | 9,918

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- Definition The maximum number of shares authorized for issuance under the deferred compensation arrangement as of the balance sheet date. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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