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Document and Entity Information
Sep. 01, 2020
Cover [Abstract]  
Document Type 8-K
Document Period End Date Sep. 01, 2020
Entity Registrant Name BCB BANCORP, INC.
Entity Incorporation, State or Country Code NJ
Entity File Number 0-50275
Entity Tax Identification Number 26-0065262
Entity Address, Address Line One 104-110 Avenue C
Entity Address, City or Town Bayonne
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 07002
City Area Code 201
Local Phone Number 823-0700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, no par value
Trading Symbol BCBP
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001228454
Amendment Flag false