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DEPOSITS -A summary of deposit balances, (Parenthetical) (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Maximum [Member]
FDIC insurance limit	$ 250,000
Minimum [Member]
FDIC insurance limit	$ 250,000

X

- Definition

Fdic Insurance limit.

+ References

No definition available.

+ Details

Name:	cfsb_FdicInsuranceLimit
Namespace Prefix:	cfsb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: