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Loans Receivable and Allowance for Loan Losses (Acquired Loans Included In Loans Receivable in Consolidated Statements of Financial Condition) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans Receivable and Allowance for Loan Losses [Abstract]
Unpaid principle balance	$ 331,490	$ 114,542
Recorded investment	$ 275,821	$ 109,695

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