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ALLOWANCE FOR LOAN LOSSES - PEB Acquisition CalCAP loan program (Details) - CalCAP Loan program $ in Millions	Sep. 30, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Immediate loss coverage percentage (%)	100.00%
Pacific Enterprise Bancorp [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loan enrolled under the program	$ 20.3
Amount of loss reserve account	6.2
Amount of loan originated under the program	4.2
Pacific Enterprise Bancorp [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loan enrolled under the program	23.2
Amount of loss reserve account	$ 13.7

X

- Definition

It represents the amount of borrowed or originated under CalCAP loan program.

+ References

No definition available.

+ Details

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

X

- Definition

It represents the amount of loss reserve account under CalCAP loan program.

+ References

No definition available.

+ Details

Name:	bcml_AmountOfLossReserveAccount
Namespace Prefix:	bcml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

It represents the amount of total loan enrolled in CalCAP loan program.

+ References

No definition available.

+ Details

Name:	bcml_AmountOfTotalLoanEnrolled
Namespace Prefix:	bcml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage of immediate coverage of loss under CalCAP loan program.

+ References

No definition available.

+ Details

Name:	bcml_ImmediateCoverageOfLossUnderCalcapLoanProgramPercentage
Namespace Prefix:	bcml_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=bcml_CaliforniaPollutionControlFinancingAuthorityLoanProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=bcml_PacificEnterpriseBancorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=bcml_PacificEnterpriseBancorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: