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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 | Mar. 31, 2020 | Dec. 31, 2019
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Loans Receivable and Allowance for Loan Losses [Abstract] |  |
Unpaid principle balance | $ 214,773 | $ 226,333
Recorded investment | $ 183,208 | $ 192,826

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