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Share-Based Compensation - Narrative (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | May 03, 2024 | Dec. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Compensation cost for awards granted |  | $ 2,900,000 | $ 2,400,000 | $ 2,000,000.0 |  |
Total income tax benefit |  | $ 605,000 | $ 506,000 | $ 421,000 |  |
Summit Financial Group, Inc |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Common stock portion, number of Burke & Herbert stock for each share of Summit common stock converted (in shares) |  |  |  |  | 0.5043 |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Shares issued during period (in shares) |  | 100,665 | 25,705 | 13,160 |  |
Restricted Stock Units (RSUs) | Minimum |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) | Maximum |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |
Restricted Stock Units (RSUs) | 2019 Stock Incentive Plan |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized to be issued (in shares) |  |  |  |  |  | 240,000
Right to receive common share |  |  |  |  |  | 1
Restricted Stock Units (RSUs) | 2023 Stock Incentive Plan |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Shares authorized to be issued (in shares) | 250,000 | 324,887 |  |  |  |
Restricted Stock Units (RSUs) | 2023 Stock Incentive Plan | Minimum |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |
Restricted Stock Units (RSUs) | 2023 Stock Incentive Plan | Maximum |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 5 years |  |  |  |
Restricted Stock Units (RSUs) | 2019 and 2023 Stock Incentive Plan |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation costs |  | $ 5,100,000 |  |  |  |
Average period for cost to be recognized (in years) |  | 1 year 5 months 19 days |  |  |  |
Performance-based RSUs |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Vesting percentage (as a percent) |  | 100.00% |  |  |  |
Employee Stock | 2023 Employee Stock Purchase Plan |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance (in shares) | 250,000 |  |  |  |  |
Number of shares available for grant (in shares) |  | 312,230 |  |  |  |
Purchase price of common stock (as a percent) | 85.00% |  |  |  |  |
Eligible employees, subscription rate (as a percent) | 15.00% |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period (in years) |  | 7 years |  |  |  |
Unrecognized compensation costs |  | $ 538,200 |  |  |  |
Average period for cost to be recognized (in years) |  | 2 years 3 months 7 days |  |  |  |
Exercisable during period (as a percent) |  | 14.30% |  |  |  |
Award expiration period |  | 10 years |  |  |  |
Exercised |  | $ 1,387,000 |  |  |  |
Vested (in shares) |  | 67,000.0 |  |  |  |

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