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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Allowance for Loan Losses (Details)	12 Months Ended
	Dec. 31, 2021
Allowance for Loan Losses [Abstract]
Number of days past for loan to be considered impaired	90 days

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- References

No definition available.

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Name:	czfs_AllowanceForLoanLossesAbstract
Namespace Prefix:	czfs_
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Period Type:	duration

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- Definition

The number of days past due before a loan is classified as impaired, measured in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	czfs_NumberOfDaysPastDueForLoanToBeConsideredImpaired
Namespace Prefix:	czfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration