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DEPOSITS - Tax Deferred Exchanges (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Deposits, Tax Deferred Exchanges	$ 4.0	$ 44.4

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- Definition

Deposits, Tax Deferred Exchanges

+ References

No definition available.

+ Details

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