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v3.24.0.1

DEPOSITS -A summary of deposit balances, (Parenthetical) (Details) $ in Thousands | Sep. 30, 2023 USD ($)
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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: |