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Bank Owned Life Insurance (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended
	Jan. 31, 2021	Aug. 31, 2020	Sep. 30, 2021
Bank Owned Life Insurance [Abstract]
Bank owned life insurance, amount			$ 71.7
Bank owned life insurance, amount purchased	$ 8.5	$ 60.0

X

- Definition

Bank Owned Life Insurance [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	bcbp_
Data Type:	xbrli:stringItemType
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X

- Definition

This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602

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Balance Type:	debit
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X

- Definition

The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 30
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6384439&loc=d3e42048-111605

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