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DEPOSITS - Tax Deferred Exchanges (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Deposits [Abstract] |  |
Deposits, Tax Deferred Exchanges | $ 4.0 | $ 44.4

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- Definition Deposits, Tax Deferred Exchanges + References No definition available. + Details
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Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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