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Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Dec. 31, 2023
Dec. 31, 2022
Subsequent Event [Member]        
Stockholders Equity [Line Items]        
Available equity of BancFirst for dividend payments to the company   $ 139.0    
Senior Preferred Stock [Member]        
Stockholders Equity [Line Items]        
Preferred stock, shares issued 0   0 0
Preferred stock, shares outstanding     0  
Cumulative Preferred Stock [Member]        
Stockholders Equity [Line Items]        
Preferred stock, shares issued 0   0  
Preferred stock, shares outstanding 0      
Dividend payable at redemption, per share $ 5.00      
Cumulative preferred stock dividend rate 10.00%