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Dividend Restrictions (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Dividend Restrictions [Abstract]
Minimum percentage of capital stock surplus under dividend restriction	50.00%
Cash dividends paid to parent company	$ 22,338,000	$ 15,885,000

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- Definition

Minimum percentage of capital stock surplus under dividend restriction.

+ References

No definition available.

+ Details

Name:	bcbp_MinimumPercentageOfCapitalStockSurplusUnderDividendRestriction
Namespace Prefix:	bcbp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50 percent or less owned persons accounted for using the equity method.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(b))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

Name:	us-gaap_CashDividendsPaidToParentCompany
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration