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Fair Value Measurements, Quantitative Information (Details) - Appraised Collateral Values [Member] $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Collateral-Dependent Loans [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans	$ 2,916	$ 3,579
Collateral-Dependent Loans [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Holding period	0 months	1 month
Collateral-Dependent Loans [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Holding period	12 months	12 months
Collateral-Dependent Loans [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Holding period	8 months 6 days	11 months 1 day
Collateral-Dependent Loans [Member] | Discount for Time Since Appraisal [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans, Measurement input	0	0
Collateral-Dependent Loans [Member] | Discount for Time Since Appraisal [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans, Measurement input	1	1
Collateral-Dependent Loans [Member] | Discount for Time Since Appraisal [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans, Measurement input	0.4194	0.3667
Collateral-Dependent Loans [Member] | Selling Costs [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans, Measurement input	0	0.04
Collateral-Dependent Loans [Member] | Selling Costs [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans, Measurement input	0.10	0.12
Collateral-Dependent Loans [Member] | Selling Costs [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans, Measurement input	0.0656	0.0705
Other Real Estate Owned [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Collateral-dependent loans	$ 2,544	$ 2,486
Other Real Estate Owned [Member] | Discount for Time Since Appraisal [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Other real estate owned, Measurement input	0.20	0.20
Other Real Estate Owned [Member] | Discount for Time Since Appraisal [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Other real estate owned, Measurement input	0.318	0.32
Other Real Estate Owned [Member] | Discount for Time Since Appraisal [Member] | Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Abstract]
Other real estate owned, Measurement input	0.3109	0.3132

X

- Definition

Value of input used to measure investment in collateral-dependent loans at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Holding period, used as an input to measure fair value, measured in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	czfs_
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X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- References

No definition available.

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- Definition

Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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- Details

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