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SUBSEQUENT EVENTS (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Subsequent Event [Line Items]
Impaired loan	$ 14,321
Certificate of deposit-secured line of credit loan
Subsequent Event [Line Items]
Cash collateral released	$ 1,000

X

- Definition

Amount of cash collateral securing the loan released by the Bank into a third-party escrow account at the request of the borrower to be used as a refundable retainer.

+ References

No definition available.

+ Details

Name:	bcml_CashCollateralReleased
Namespace Prefix:	bcml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of investment of impaired financing receivables excluding accrued interest with related allowance for credit losses and without a related allowance for credit losses.

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=bcml_SecuredLineOfCreditLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: