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LOANS - Troubled Debt Restructurings - General Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
LOANS
Amount of the write-down related to a troubled debt restructuring	$ 0	$ 0	$ 0	$ 1,300,000
Financing receivable, modified, excluding accrued interest, allowance for credit losses, individually evaluated for impairment	0		0		$ 24,000
Accumulated amortized cost of financing receivable	0		0		0
Revolving loans converted to term loans	$ 0		$ 0		$ 867,000

X

- Definition

Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

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

X

- Definition

valuation allowance excluding accrued interest for financing receivable modified for debtor experiencing financial difficulty that are expected to be uncollectible that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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

X

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of revolving loans converted to term loans.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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