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Summary of Significant Accounting Policies (Summary of Useful Lives of Property, Plant and Equipment) (Details) | 12 Months Ended
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Dec. 31, 2023
Building [Member] |
Property, Plant and Equipment [Line Items] |
Premises and equipment, useful life | 40 years
Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Premises and equipment, useful life description | Shorter of useful life or term of lease
Minimum [Member] | Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Premises and equipment, useful life | 7 years
Minimum [Member] | Furniture, Fixtures And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Premises and equipment, useful life | 5 years
Maximum [Member] | Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Premises and equipment, useful life | 40 years
Maximum [Member] | Furniture, Fixtures And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Premises and equipment, useful life | 7 years

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- Definition Premises and equipment, useful life description. + References No definition available. + Details
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Namespace Prefix: | bcbp_
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Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |