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Share-Based Compensation - Narrative (Details)
 3 Months Ended 6 Months Ended
Mar. 30, 2023
shares
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
May 03, 2024
shares
Dec. 31, 2023
shares
Dec. 31, 2019
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Compensation cost for awards granted | $   $ 1,500,000 $ 937,600 $ 2,400,000 $ 1,400,000      
Total income tax benefit | $   310,400 $ 196,900 $ 499,500 $ 291,500      
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)       96,132 48,450      
Unrecognized compensation costs | $   $ 7,800,000   $ 7,800,000        
Average period for cost to be recognized (in years)       1 year 5 months 23 days        
Restricted Stock Units (RSUs) | Minimum                
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                
Award vesting period (in years) 3 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     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 (in shares)               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)   324,887   324,887     250,000  
Performance-based Restricted Stock Units                
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)   305,210   305,210        
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 | $   $ 383,200   $ 383,200        
Average period for cost to be recognized (in years)       2 years 1 month 17 days        
Exercisable during period (as a percent)   14.30%   14.30%        
Award expiration period (in years)       10 years        
Total fair value exercised | $       $ 657,000        
Vested (in shares)       78,000