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PREMISES AND EQUIPMENT - Depreciation and Amortization (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization included in occupancy and equipment expense	$ 518,000	$ 430,000	$ 1,000,000.0	$ 883,000

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- Definition

Occupancy, Net, Depreciation and Amortization

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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