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Defined Benefit Pension Plan - Narrative (Details)	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Defined benefit plan, vesting period	5 years

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- Definition

Defined Benefit Plan, Vesting Period

+ References

No definition available.

+ Details

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Namespace Prefix:	bhrb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration