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LOANS - Troubled Debt Restructurings - General Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Receivables [Abstract]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default		$ 0		$ 0
Accumulated amortized cost of financing receivable	$ 0		$ 0		$ 759,000
Amount of the write-down related to a troubled debt restructuring	0	2,400	0	0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	0		0
Loans individually evaluated for impairment	$ 342,000	$ 998	$ 342,000	$ 998	$ 393,000

X

- Definition

Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

Name:	bcml_FinancingReceivableExcludingAccruedInterestModifiedAfter12Months
Namespace Prefix:	bcml_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

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

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration