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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Allowance for Loan Losses (Details) | 12 Months Ended
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Dec. 31, 2020
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. + Details
Name: | czfs_AllowanceForLoanLossesAbstract
Namespace Prefix: | czfs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of days past due before a loan is classified as impaired. + References No definition available. + Details
Name: | czfs_NumberOfDaysPastDueForLoanToBeConsideredImpaired
Namespace Prefix: | czfs_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration