Regulatory Capital Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Consolidated
Total Capital to risk weighted assets
Actual Amount	$ 443,293	$ 433,958
Actual Ratio	0.1748	0.1888
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 266,306	$ 241,325
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.105	0.105
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 253,625	$ 229,834
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.100	0.100
Tier 1 (Core) Capital to risk weighted assets
Actual Amount	$ 416,977	$ 412,946
Actual Ratio	0.1644	0.1797
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 215,581	$ 195,358
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.085	0.085
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 202,900	$ 186,867
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.080	0.080
Common Tier 1 (CET 1) to risk-weighted assets
Actual Amount	$ 416,977	$ 412,946
Actual Ratio	0.1644	0.1797
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 177,537	$ 160,883
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.070	0.070
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 164,856	$ 149,392
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.065	0.065
Tier 1 (Core) Capital to average assets
Actual Amount	$ 416,977	$ 412,946
Actual Ratio	0.1132	0.1134
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 147,333	$ 145,605
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 184,166	$ 182,007
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.050	0.050
Burke & Herbert Bank & Trust
Total Capital to risk weighted assets
Actual Amount	$ 441,597	$ 432,290
Actual Ratio	0.1739	0.1881
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 266,587	$ 241,368
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.105	0.105
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 253,893	$ 229,874
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.100	0.100
Tier 1 (Core) Capital to risk weighted assets
Actual Amount	$ 415,281	$ 411,251
Actual Ratio	0.1636	0.1789
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 215,809	$ 195,393
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.085	0.085
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 203,114	$ 183,900
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.080	0.080
Common Tier 1 (CET 1) to risk-weighted assets
Actual Amount	$ 415,281	$ 411,251
Actual Ratio	0.1636	0.1789
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 177,725	$ 160,912
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.070	0.070
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 165,030	$ 149,418
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.065	0.065
Tier 1 (Core) Capital to average assets
Actual Amount	$ 415,281	$ 411,251
Actual Ratio	0.1127	0.1130
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 147,417	$ 145,605
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Ratio	0.040	0.040
To Be Well Capitalized Under Prompt Corrective Action Regulations Amount	$ 184,271	$ 182,007
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.050	0.050

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-Topic 942
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