Regulatory Capital Matters - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) $ in Thousands	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Consolidated
Total Capital to risk weighted assets
Actual Amount	$ 445,121	$ 443,799
Actual Ratio	0.1754	0.1788
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 266,504	$ 260,694
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	$ 253,814	$ 248,280
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.100	0.100
Tier 1 (Core) Capital to risk weighted assets
Actual Amount	$ 420,261	$ 418,244
Actual Ratio	0.1656	0.1685
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 215,742	$ 211,038
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	$ 203,051	$ 198,624
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	$ 420,261	$ 418,244
Actual Ratio	0.1656	0.1685
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 177,670	$ 173,796
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	$ 164,979	$ 161,382
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.065	0.065
Tier 1 (Core) Capital to average assets
Actual Amount	$ 420,261	$ 418,244
Actual Ratio	0.1136	0.1131
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 148,038	$ 147,965
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	$ 185,048	$ 184,957
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	$ 442,168	$ 442,414
Actual Ratio	0.1743	0.1782
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 266,399	$ 260,626
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	$ 253,713	$ 248,215
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.100	0.100
Tier 1 (Core) Capital to risk weighted assets
Actual Amount	$ 417,308	$ 416,859
Actual Ratio	0.1645	0.1679
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 215,656	$ 210,983
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	$ 202,971	$ 198,572
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	$ 417,308	$ 416,859
Actual Ratio	0.1645	0.1679
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 177,599	$ 173,751
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	$ 164,914	$ 161,340
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.065	0.065
Tier 1 (Core) Capital to average assets
Actual Amount	$ 417,308	$ 416,859
Actual Ratio	0.1128	0.1127
Minimum Required for Capital Adequacy Purposes (includes applicable capital conservation buffer) Amount	$ 148,035	$ 147,986
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	$ 185,044	$ 184,982
To Be Well Capitalized Under Prompt Corrective Action Regulations Ratio	0.050	0.050

Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy With Buffer, Minimum

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-Topic 942
-SubTopic 505
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-Section 50
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