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LOANS (Details 4) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Unpaid Principal Balance	$ 15,080	$ 17,417
Carrying Value	12,599	14,315
Consumer [Member]
Unpaid Principal Balance	0	0
Carrying Value	0	0
Commercial real estate [Member]
Unpaid Principal Balance	13,161	15,536
Carrying Value	11,206	13,017
Residential [Member]
Unpaid Principal Balance	1,789	1,732
Carrying Value	1,391	1,295
Commercial and industrial [Member]
Unpaid Principal Balance	130	149
Carrying Value	2	3
Construction and land [Member]
Unpaid Principal Balance		0
Carrying Value	$ 0	$ 0

X

- Definition

Represents the monetary amount of Purchase Credit Impaired Loans Carrying Value, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Purchase Credit Impaired Loans Unpaid Principal Balance, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ConsumerLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CollateralAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquitySecuritiesByIndustryAxis=us-gaap_CommercialAndIndustrialSectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquitySecuritiesByIndustryAxis=bcml_ConstructionAndLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: