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Stock-Based Compensation - Additional Information (Detail)
 12 Months Ended 12 Months Ended
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%