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Stock-Based Compensation - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2024 | Jun. 01, 2023 | May 25, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Net cash settlement for stock options, cost |  |  |  | $ 0 | $ 0
Deferred board fees percentage for stock units accumulation |  |  |  | 100.00% |
RSU's Plan [Member] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |
Shares for future grants | 462,925 |  |  | 462,925 |
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 |  |
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 |  |  |  | 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 [Member] |  |  |  |  |
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 |
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, 2024 |
Number of shares available for future issuance under deferred compensation plan | 15,923 |  |  | 15,923 |
Number of shares of common stock distributed |  |  |  | 5,022 | 17,392

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