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Stock-Based Compensation - Additional Information (Detail) - shares |  |  | 9 Months Ended
--- | --- | --- | ---
Jun. 01, 2023 | May 25, 2023 | Sep. 30, 2025 | Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Cash settlement for stock options, number of shares |  |  | 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 |  |  | 434,925 |
Option exercisable rate |  |  | 20.00% |
Option excercisable 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 |  |  | 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 [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, 2030 |
Number of shares available for future issuance under deferred compensation plan |  |  | 29,559 |
Number of shares of common stock distributed |  |  | 6,462 | 5,022

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