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Stock-Based Compensation - Additional Information (Detail) | 12 Months Ended |  |  | 12 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2013 Incentive Stock Option Plan [Member] | May 31, 2013 Incentive Stock Option Plan [Member] | Dec. 31, 2013 Incentive Stock Option Plan [Member] Minimum [Member] | Dec. 31, 2013 Non Employee Directors Stock Option Plan [Member] | May 31, 2009 Non Employee Directors Stock Option Plan [Member] | Dec. 31, 2013 Non Employee Directors Stock Option Plan [Member] Minimum [Member] | May 31, 2009 Banc First Deferred Stock Compensation Plan [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 |  |  | 205,000 |  |
Shares for future grants |  | 145,860 |  |  | 5,000 |  |  |
Option exercisable rate |  | 25.00% |  |  | 25.00% |  |  |
Option exercisable period |  | 4 years |  |  | 1 year |  |  |
Options expire period |  | 15 years |  |  | 15 years |  |  |
Share based compensation options exercisable period |  | 2020 |  |  | 2017 |  |  |
Stock price percentage to fair value at grant date |  |  |  | 100.00% |  |  | 100.00% |
Vesting period in years | 7 years | 4 years |  |  | 4 years |  |  |
Options vest and exercisable Description |  | The options vest and 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. |  |  | The options vest and are exercisable beginning one year from the date of grant at the rate of 25% per year for four years. |  |  |
Stock option plan termination date |  | Dec. 31, 2014 |  |  |  |  |  |
Number of options granted for non-employee director | 10,000 |  |  |  |  |  |  |
Number of shares authorized for issuance under deferred compensation plan |  |  |  |  |  |  |  | 80,000
Deferred board fees percentage for stock units accumulation | 100.00% |  |  |  |  |  |  |

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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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