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INVESTMENT SECURITIES - Realized Gains (Details) - security	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
INVESTMENT SECURITIES
Number of available for sale debt securities sold	0	0	0	0

X

- Definition

The number of available for sale debt securities sold during the period.

+ References

No definition available.

+ Details

Name:	bcml_NumberOfAvailableForSaleDebtSecuritiesSold
Namespace Prefix:	bcml_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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