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LEASES - General Information (Details)	Sep. 30, 2023 location
Lessee, Lease, Description [Line Items]
Number of offices and branches	35
Noncancelable Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Number of offices and branches	20

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

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

X

- Definition

Represents the number of stores.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStores
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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