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OTHER BORROWINGS - Federal Funds Line - Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Federal Funds Line, Cumulative Available Commitments [Member]
Other Commitments [Line Items]
Other Commitment	$ 75.0	$ 55.0

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=bcml_FederalFundsLineCumulativeAvailableCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: