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INVESTMENT SECURITIES - Realized Gains (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 security	Sep. 30, 2021 USD ($) security	Sep. 30, 2022 security	Sep. 30, 2021 USD ($) security
Investments, Debt and Equity Securities [Abstract]
Number of available for sale debt securities sold | security	0	6	1	6
Net realized gain on sale of securities available-for-sale | $		$ (22,000)		$ (22,000)

X

- Definition

The number of available for sale debt securities sold during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcml_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563

+ Details

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

X

- References

No definition available.

+ Details

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