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LOANS - Pledged Loans (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Unpaid principal balances	$ 1,060.0	$ 1,040.0
Asset Pledged as Collateral | Federal Reserve Bank Advances
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Financing Receivable, Unpaid Principal Balance	$ 79.7	$ 76.7

X

- Definition

Amount of unpaid principal balance of financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	bcml_
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Balance Type:	debit
Period Type:	instant

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of the collateral pledged in support of federal home loan bank advances outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478878/942-470-45-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

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- Details

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X

- Details

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