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Stock-Based Compensation (Details Textual) | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2012 Incentive Stock Option Plan [Member] | May 31, 2011 Incentive Stock Option Plan [Member] | Dec. 31, 2012 Non-Employee Directors Stock Option Plan [Member] | May 31, 2009 Non-Employee Directors Stock Option Plan [Member] | May 31, 2009 BancFirst Deferred Stock Compensation Plan [Member]
Stock-Based Compensation (Textual) [Abstract] |  |  |  |  |  |
Number of shares authorized for issuance under deferred compensation plan |  |  |  |  |  | 80,000
Number of shares to be issued under incentive stock option plan |  |  | 2,800,000 |  | 205,000 |
Shares for future grants |  | 15,860 |  | 30,000 |  |
Option exercisable rate |  | 25.00% |  | 25.00% |  |
Option exercisable period |  | 4 years |  | 4 years |  |
Options expire period |  | 15 years |  | 15 years |  |
Share based compensation options exercisable period |  | 2019 |  | 2015 |  |
Minimum stock price at time of exercise of options, percentage |  | 100.00% |  | 100.00% |  |
Vesting period in years |  | 7 years |  |  |  |
Options Exercisable Description |  | The options are exercisable beginning four years from the date of grant at the rate of 25% per year for four years. |  | The options are exercisable beginning one year from the date of grant at the rate of 25% per year for four years, and expire at the end of fifteen years from the date of grant. |  |
Stock option plan termination date |  | Dec. 31, 2014 |  |  |  |
Stock-Based Compensation (Additional Textual) [Abstract] |  |  |  |  |  |
Deferred board fees percentage for stock units accumulation | 100.00% |  |  |  |  |
Number of options granted for non-employee director | 10,000 |  |  |  |  |

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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 Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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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