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PREMISES AND EQUIPMENT - Depreciation and Amortization (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Depreciation, Depletion and Amortization [Abstract] |  |  |  |
Depreciation and amortization included in occupancy and equipment expense | $ 489 | $ 519 | $ 1,500 | $ 1,500

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- Definition Occupancy, Net, Depreciation and Amortization + References No definition available. + Details
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Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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