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Stock-Based Compensation - Additional Information (Detail) - shares
 12 Months Ended
Jun. 01, 2023
May 25, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Cash settlement for stock options, number of shares     0 0 0
Deferred board fees percentage for stock units accumulation     100.00%    
Stock option granted     0 0  
RSU's Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares for future grants     457,175    
Option exercisable rate     20.00%    
Option exercisable period     2 years    
Options expire period   10 years      
Options vest and exercisable Description     The restricted stock units ("RSU's") vest beginning two years from the date of grant at the rate of 20% per year for five years.    
Vesting period in years     5 years    
Non-Employee Directors Stock Option Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock option plan termination date Jun. 01, 2023        
Option exercisable rate     25.00%    
Option exercisable period     1 year    
Options expire period     15 years    
Options vest and exercisable Description     The remaining options will continue to vest and are exercisable beginning one year from the date of grant at the rate of 25% per year for four years    
Vesting period in years     4 years    
Banc First Deferred Stock Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock option plan termination date     Dec. 31, 2030    
Number of shares available for future issuance under deferred compensation plan     35,647    
Number of shares of common stock distributed     7,031 18,136  
Employee Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock option plan termination date Jun. 01, 2023        
Option exercisable rate     25.00%    
Options expire period     15 years    
Vesting period in years, start     4 years    
Options vest and exercisable Description     The remaining options will continue to vest and are exercisable beginning four years from the date of grant at the rate of 25% per year for four years, and expire no later than the end of fifteen years from the date of grant    
Vesting period in years     4 years    
Employee Plan [Member] | Employee Stock Option          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period in years     5 years    
Employee Plan [Member] | RSU's Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Vesting period in years     6 years