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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
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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

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- 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

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration