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RESTRICTIONS ON CASH AND AMOUNTS DUE FROM BANKS - Additional Information (Details) - USD ($)	Dec. 31, 2023	Jun. 30, 2023	Mar. 26, 2020
Cash and Cash Equivalents [Abstract]
Federal reserve requirement ratio			0.00%
Federal reserve bank stock	$ 0	$ 0

X

- Definition

Federal reserve requirement ratio.

+ References

No definition available.

+ Details

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Namespace Prefix:	cfsb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 325
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481026/942-325-45-1

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant