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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