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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders Equity [Line Items]      
Available equity of BancFirst for Dividend payments to the Company $ 65,700,000    
Minimum Tier 1 Ratio to be well capitalized 6.00%    
Minimum combined Tier 1 and Tier 2 Ratio to be well capitalized 10.00%    
Minimum Leverage Ratio to be well capitalized 5.00%    
Maximum [Member]
      
Stockholders Equity [Line Items]      
Quantitative limit for trust preferred securities to be included in tier 1 capital $ 10,000,000,000    
Cumulative preferred stock [Member]
      
Stockholders Equity [Line Items]      
Preferred stock, shares issued        
Preferred stock, shares outstanding         
Cumulative preferred stock dividend rate 10.00%    
Dividend payable at redemption, per share $ 5.00    
Senior preferred stock [Member]
      
Stockholders Equity [Line Items]      
Preferred stock, shares issued        
Preferred stock, shares outstanding         
2015 [Member]
      
Stockholders Equity [Line Items]      
Implementation of the deductions and other adjustments to CET1 4 years    
Implementation of the deductions and other adjustments to CET1, Percentage 40.00%    
2015 [Member] | Minimum [Member]
      
Stockholders Equity [Line Items]      
Minimum ratio of CET1 to risk-weighted assets 4.50%    
Tier 1 capital to risk-weighted assets 6.00%    
Total capital to risk weighted assets 8.00%    
Minimum leverage ratio 4.00%    
2016 [Member]
      
Stockholders Equity [Line Items]      
Implementation of the capital conservation buffer, Percentage 0.625%    
Capital conservation buffer implementation phaseout period 4 years    
2019 [Member]
      
Stockholders Equity [Line Items]      
Capital Conservation Buffer Maximum Level 2.50%    
After 2015 [Member]
      
Stockholders Equity [Line Items]      
Implementation of the deductions and other adjustments to CET1, Additional Percentage 20.00%