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INVESTMENT SECURITIES - Realized Gains (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 security | Sep. 30, 2021 USD ($) security | Sep. 30, 2022 security | Sep. 30, 2021 USD ($) security
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Number of available for sale debt securities sold | security | 0 | 6 | 1 | 6
Net realized gain on sale of securities available-for-sale | $ |  | $ (22,000) |  | $ (22,000)

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
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration