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LOANS - Troubled Debt Restructurings - General Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
LOANS |  |  |  |  |
Amount of the write-down related to a troubled debt restructuring | $ 0 | $ 0 | $ 0 | $ 1,300,000 |
Financing receivable, modified, excluding accrued interest, allowance for credit losses, individually evaluated for impairment | 0 |  | 0 |  | $ 24,000
Accumulated amortized cost of financing receivable | 0 |  | 0 |  | 0
Revolving loans converted to term loans | $ 0 |  | $ 0 |  | $ 867,000

X
- Definition Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty. + References No definition available. + Details
Name: | bcml_FinancingReceivableModifiedAccumulated
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition valuation allowance excluding accrued interest for financing receivable modified for debtor experiencing financial difficulty that are expected to be uncollectible that were individually evaluated for impairment. + References No definition available. + Details
Name: | bcml_FinancingReceivableModifiedExcludingAccruedInterestAllowanceForCreditLossesIndividuallyEvaluatedForImpairment
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References No definition available. + Details
Name: | bcml_FinancingReceivablesImpairedExcludingAccruedInterestTroubledDebtRestructuringWriteDown
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of revolving loans converted to term loans. + References No definition available. + Details
Name: | bcml_RevolvingLoansConvertedToTermLoans
Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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