XML 41 R31.htm IDEA: XBRL DOCUMENT v3.25.1

Basis of Presentation (Narrative) (Details)	3 Months Ended
	Mar. 31, 2025 item
Basis of Presentation [Abstract]
Number of locations	27

X

- Definition

Number Of Locations

+ References

No definition available.

+ Details

Name:	bcbp_NumberOfLocations
Namespace Prefix:	bcbp_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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