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Subordinated Debenture (Trust Preferred Junior Subordinated Debenture) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Subordinated Borrowing [Line Items]    
Subordinated Debt $ 4,124us-gaap_SubordinatedDebt 4,124us-gaap_SubordinatedDebt
Trust Preferred Junior Subordinated Debenture [Member]    
Subordinated Borrowing [Line Items]    
Subordinated Borrowing, Issuance Date Jun. 17, 2004  
Subordinated Debt $ 4,124us-gaap_SubordinatedDebt
/ us-gaap_SubordinatedBorrowingAxis
= bcbp_TrustPreferredJuniorSubordinatedDebentureMember
 
Subordinated Borrowing, Liquidation Value per Share $ 1,000bcbp_SubordinatedBorrowingLiquidationValuePerShare
/ us-gaap_SubordinatedBorrowingAxis
= bcbp_TrustPreferredJuniorSubordinatedDebentureMember
 
Subordinated Borrowing, Coupon Rate Floating 3-month LIBOR + 265 Basis Points  
Subordinated Borrowing, Due Date Jun. 17, 2034  
Subordinated Borrowing, Earliest Redeemable by Issuer Jun. 17, 2009  
Subordinated Borrowing, Interest Rate 2.893%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_SubordinatedBorrowingAxis
= bcbp_TrustPreferredJuniorSubordinatedDebentureMember
2.894%us-gaap_SubordinatedBorrowingInterestRate
/ us-gaap_SubordinatedBorrowingAxis
= bcbp_TrustPreferredJuniorSubordinatedDebentureMember