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Nature of Business Activities and Significant Accounting Policies - Narrative (Details)
 12 Months Ended
May 03, 2024
shares
Dec. 31, 2024
USD ($)
segment
branch
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Number of branches, more than | branch   77      
Reserve balance requirements   $ 0   $ 0  
Cash reserve deposit required and made   $ 0   0  
Debt securities, available-for-sale, accrued interest, after allowance for credit loss, statement of financial position [extensible enumeration]   Accrued interest receivable      
Accrued interest receivable on available-for-sale debt securities   $ 10,300,000      
Financing receivable, accrued interest, after allowance for credit loss, statement of financial position [extensible enumeration]   Accrued interest receivable      
Accrued interest receivable on loans   $ 24,100,000      
Number of operating segment | segment   1      
Number of reportable segment | segment   1      
Allowance for credit losses on loans   $ 68,040,000 $ 21,039,000 25,301,000 $ 31,709,000
Decrease in retained earnings, net of deferred taxes   $ (434,106,000)   $ (427,333,000)  
Cumulative Effect, Period of Adoption, Adjustment          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses on loans     4,125,000    
Credit losses on unfunded commitments     274,800    
Decrease in retained earnings, net of deferred taxes     $ 3,400,000    
Building and Building Improvements          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life   40 years      
Minimum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Term of issuance of loan commitment   15 days      
Useful lives (in years)   7 years      
Minimum | Furniture and Fixtures          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life   3 years      
Maximum          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Term of issuance of loan commitment   90 days      
Useful lives (in years)   10 years      
Maximum | Furniture and Fixtures          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Useful life   10 years      
Summit Financial Group, Inc          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Common stock portion, number of Burke & Herbert stock for each share of Summit common stock converted (in shares) | shares 0.5043        
Expected Burke & Herbert common stock to be issued (in shares) | shares 7,405,772