SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Cash Reserve Requirement (Details)	Mar. 26, 2020
Cash Reserve Requirement [Abstract]
Ratio of cash reserve required	0.00%

Ratio of cash reserve required to be maintained against transaction deposits.

No definition available.

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