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DEPOSITS - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deposits [Abstract]
Certificates of deposit, threshold	$ 250	$ 250
Certificates of deposit	68,600	57,800
Uninsured deposits	$ 991,600	$ 1,100,000

X

- Definition

Amount of interest-bearing domestic certificate of deposit liabilities threshold for reporting.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcml_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of uninsured deposit liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1406
-Paragraph (e)

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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X

- Definition

Amount of interest-bearing domestic certificate of deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

+ Details

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