Loans, Credit Quality Indicator, Summary (Details) - Minimum [Member] $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($)
Financing Receivable [Abstract]
Amount over which all relationships to be reviewed, minimum	$ 500
Percentage of dollar volume of commercial loan portfolio to be reviewed	50.00%
Amount over which all new loans to be reviewed	$ 1,000
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

- Definition

Represents amount over which all new loans 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_AmountOverWhichAllNewLoansToBeReviewed
Namespace Prefix:	czfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- 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

- 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

- References

No definition available.

+ Details

Name:	czfs_FinancingReceivableAbstract
Namespace Prefix:	czfs_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: