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ALLOWANCE FOR LOAN LOSSES - PEB Acquisition CalCAP loan program (Details) - CalCAP Loan program $ in Millions | Sep. 30, 2022 USD ($)
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Financing Receivable, Allowance for Credit Loss [Line Items] |
Immediate loss coverage percentage (%) | 100.00%
Pacific Enterprise Bancorp [Member] |
Financing Receivable, Allowance for Credit Loss [Line Items] |
Total loan enrolled under the program | $ 29.3
Amount of loss reserve account | 6.1
Amount of loan originated under the program | 4.4
Pacific Enterprise Bancorp [Member] |
Financing Receivable, Allowance for Credit Loss [Line Items] |
Total loan enrolled under the program | 30.0
Amount of loss reserve account | $ 13.7

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- Definition It represents the amount of borrowed or originated under CalCAP loan program. + References No definition available. + Details
Name: | bcml_AmountOfLoanBorrowedUnderCalcabProgram
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition It represents the amount of loss reserve account under CalCAP loan program. + References No definition available. + Details
Name: | bcml_AmountOfLossReserveAccount
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition It represents the amount of total loan enrolled in CalCAP loan program. + References No definition available. + Details
Name: | bcml_AmountOfTotalLoanEnrolled
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage of immediate coverage of loss under CalCAP loan program. + References No definition available. + Details
Name: | bcml_ImmediateCoverageOfLossUnderCalcapLoanProgramPercentage
Namespace Prefix: | bcml_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- 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_FinancingReceivableAllowanceForCreditLossesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=bcml_CaliforniaPollutionControlFinancingAuthorityLoanProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=bcml_PacificEnterpriseBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=bcml_PacificEnterpriseBancorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |