XML 41 R31.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

Basis of Presentation (Narrative) (Details) | 6 Months Ended
--- | ---
Jun. 30, 2024 item
Basis of Presentation [Abstract] |
Number of locations | 28

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