Name:	cwbc_AllowanceForLoanLossesToGrossLoansHeldForInvestment
Namespace Prefix:	cwbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Financing receivables that are less than 90 days past due but more than 29 days past due and still accruing.

No definition available.

Name:	cwbc_FinancingReceivableRecordedInvestment30To89DaysPastDueAndStillAccruing
Namespace Prefix:	cwbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

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

Recorded investment in financing receivables only guaranteed amount that are on nonaccrual status as of the balance sheet date.

No definition available.

Name:	cwbc_FinancingReceivableRecordedInvestmentNonaccrualStatusGuaranteedAmount
Namespace Prefix:	cwbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5111-111524

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554