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Stock-Based Compensation - Additional Information (Detail) - shares | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | May. 31, 2014 | May. 31, 2013
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 |  |  | 3,000,000
Shares for future grants | 5,735 |  |
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 | 2023 |  |
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 |  | 230,000 |
Shares for future grants | 10,000 |  |
Option exercisable rate | 25.00% |  |
Option exercisable period | 1 year |  |
Options expire period | 15 years |  |
Share based compensation options exercisable period | 2020 |  |
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 |  | 91,110 |
Number of shares of common stock distributed | 758 |  |

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