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LOANS - Troubled Debt Restructuring Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
LOANS |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 0 | $ 0
Financing Receivable, TDR Loans, Allowance for Loan Losses | 35 | 171
Impaired Financing Receivable, Related Allowance | 521 | 171
Loans and Leases Receivable Performing Nonaccrual of Interest | $ 798 | $ 789

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- Definition Amount of allowance for loan losses. + 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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- Definition It represent that loans were performing in accordance. + References No definition available. + Details
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Namespace Prefix: | bcml_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Reflects the amount of the write-down related to a troubled debt restructuring. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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