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Dividend Restrictions (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Dividend Restrictions [Abstract]
Minimum percentage of capital stock surplus under dividend restriction	50.00%
Cash dividends paid to parent company	$ 18,212	$ 12,033

X

- Definition

Minimum percentage of capital stock surplus under dividend restriction.

+ References

No definition available.

+ Details

Name:	bcbp_MinimumPercentageOfCapitalStockSurplusUnderDividendRestriction
Namespace Prefix:	bcbp_
Data Type:	num: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% 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 http://asc.fasb.org/extlink&oid=26873400&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