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LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES, Credit Quality Indicator (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($)
Financing Receivable [Abstract] |
Amount over which all relationships to be reviewed, minimum | $ 500
Minimum [Member] |
Financing Receivable [Abstract] |
Percentage of dollar volume of commercial loan portfolio to be reviewed | 50.00%
Amount over which all relationships to be reviewed | $ 1,000
Amount which is 30 days past due to be reviewed for all aggregate loan relationships | $ 750

X
- Definition Represents amount over which all relationships to be reviewed for all internal and external loan on aggregate basis to ensure the appropriateness of the loan grade. + References No definition available. + Details
Name: | czfs_AmountOverWhichAllRelationshipToBeReviewed
Namespace Prefix: | czfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents amount over which all new relationship to be reviewed for all internal and external loan on aggregate basis to ensure the appropriateness of the loan grade. + References No definition available. + Details
Name: | czfs_AmountOverWhichAllRelationshipToBeReviewedMinimum
Namespace Prefix: | czfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents amount to be reviewed for all internal and external loan all aggregate loan relationships which are over 30 days past due to ensure the appropriateness of the loan grade. + References No definition available. + Details
Name: | czfs_AmountWhichIs30DaysPastDueToBeReviewedForAllAggregateLoanRelationships
Namespace Prefix: | czfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | czfs_FinancingReceivableAbstract
Namespace Prefix: | czfs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to percentage of dollar volume of commercial loan portfolio to be reviewed on annual basis . + References No definition available. + Details
Name: | czfs_PercentageOfCommercialLoanPortfolioToBeReviewed
Namespace Prefix: | czfs_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |