Name:	cwbc_AllowanceForLoanLossesToGrossLoansHeldForInvestment
Namespace Prefix:	cwbc_
Data Type:	dtr-types: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 accruing interest.

No definition available.

Name:	cwbc_FinancingReceivableRecordedInvestment30To89DaysPastDueAndAccruingInterest
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

Amount of financing receivable modified as troubled debt restructuring.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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

Amount of financing receivable 90 days or more past due and still accruing.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448

Name:	us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of financing receivable on nonaccrual status.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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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).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
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