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Business Combination - Narrative (Details) - USD ($)
 5 Months Ended 12 Months Ended
May 03, 2024
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Business Acquisition [Line Items]            
Preliminary goodwill     $ 32,783,000 $ 0 $ 0 $ 0
Summit Financial Group, Inc            
Business Acquisition [Line Items]            
Common stock portion, number of Burke & Herbert stock for each share of Summit common stock converted (in shares) 0.5043          
Consideration payable (in shares) 7,405,772          
Preferred stock, fixed rate (as a percent) 6.00%          
Net interest income   $ 99,900,000        
Net income   $ 111,300,000        
Preliminary goodwill $ 32,783,000          
Goodwill, expected tax deductible amount $ 0          
Estimated weighted average life 7 years          
Goodwill and intangibles $ 68,760,000          
Summit Financial Group, Inc | Financial Asset Acquired with Credit Deterioration            
Business Acquisition [Line Items]            
Business combination, acquired receivable, fair value 380,800,000          
Business combination, acquired receivable, gross contractual amount 442,300,000          
Business combination, acquired receivable, estimated uncollectible $ 23,900,000          
Summit Financial Group, Inc | Noninterest Expense            
Business Acquisition [Line Items]            
Merger-related expenses     36,500,000      
Summit Financial Group, Inc | Salary and Wage, Excluding Cost of Good and Service Sold, Employee Benefits and Share-Based Compensation, Occupancy, Net, and Equipment Expense            
Business Acquisition [Line Items]            
Merger-related expenses     $ 19,500,000