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COMMITMENTS AND CONTINGENCIES - Local Agency Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
COMMITMENTS AND CONTINGENCIES
Federal Home Loan Bank, Letters of Credit	$ 30.1	$ 21.5

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- Definition

Federal Home Loan Bank, Letters of Credit

+ References

No definition available.

+ Details

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Namespace Prefix:	bcml_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- References

No definition available.

+ Details

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