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Loans Receivable and Allowance for Loan Losses (Unpaid Principal Balance and Related Recorded Investment of Acquired Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Loans Receivable and Allowance for Loan Losses [Abstract]
Unpaid principle balance	$ 140,969	$ 179,601
Recorded investment	$ 122,533	$ 152,556

X

- Definition

Value as of the balance sheet date of the recorded investment of acquired loans.

+ References

No definition available.

+ Details

Name:	bcbp_AcquiredLoansRecordedInvestment
Namespace Prefix:	bcbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value as of the balance sheet date of the unpaid principal balances of acquired loans.

+ References

No definition available.

+ Details

Name:	bcbp_AcquiredLoansUnpaidPrincipalBalance
Namespace Prefix:	bcbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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