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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