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v3.25.3

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