Name:	cwbc_LoansHeldForInvestmentAndInterestAndFeesFromLoansAbstract
Namespace Prefix:	cwbc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Refers to the number of categories considered to be acceptable loans.

No definition available.

Name:	cwbc_NumberOfCategoriesConsideredToBeAcceptableLoans
Namespace Prefix:	cwbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Refers to the number of categories in the pass categories of loans receivable.

No definition available.

Name:	cwbc_NumberOfCategoriesInPassCategories
Namespace Prefix:	cwbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Number of days on new deferral program for modifications of payment deferrals in Guidance on Non-TDR Loan Modifications due to COVID-19, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cwbc_NumberOfDaysOnNewDeferralProgramForModificationsOfPaymentDeferrals
Namespace Prefix:	cwbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Refers to the number of delinquent payments after which loan is considered as uncollectible.

No definition available.

Name:	cwbc_NumberOfDelinquentPaymentsForUnsecuredLoansToBeChargedOff
Namespace Prefix:	cwbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

The percentage of loan amount modified due to COVID-19 to total loan portfolio.

No definition available.

Name:	cwbc_PercentageOfLoanAmountModifiedDueToCOVID19ToTotalLoanPortfolio
Namespace Prefix:	cwbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the period of delinquency after which a loan is placed in a nonaccrual status and ceases recognizing interest income, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cwbc_PeriodOfDelinquencyAfterWhichALoanIsPlacedInNonaccrualStatus
Namespace Prefix:	cwbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Refers to period past due either of principal or interest, after which loans are evaluated for impairment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cwbc_PeriodPastDueAfterWhichLoansAreEvaluatedForImpairment
Namespace Prefix:	cwbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Refers to period past due for unsecured loans to be charged off, in the event there is no perceived equity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cwbc_PeriodPastDueForUnsecuredLoansToBeChargedOff
Namespace Prefix:	cwbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

Name:	us-gaap_FinancingReceivableThresholdPeriodPastDueWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

Name:	us-gaap_ProvisionForLoanAndLeaseLossesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_UnusualOrInfrequentItemAxis=cwbc_COVID19Member
Namespace Prefix:
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Balance Type:
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Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cwbc_OtherPersonalLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cwbc_SmallBusinessAdministrationLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cwbc_SingleFamilyRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: