Fair Value Measurements, Quantitative Information (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
Sep. 30, 2013	Dec. 31, 2012
Impaired Loans [Member] \| Discounted Cash Flows [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 4,470	$ 4,882
Valuation Technique(s)	Discounted Cash Flows
Impaired Loans [Member] \| Discounted Cash Flows [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Change in discount rates (in hundredths)	0.00%
Impaired Loans [Member] \| Discounted Cash Flows [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Change in discount rates (in hundredths)	7.00%
Impaired Loans [Member] \| Appraised Collateral Values [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	5,818	4,954
Valuation Technique(s)	Appraised Collateral Values
Impaired Loans [Member] \| Appraised Collateral Values [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal (in hundredths)	0.00%
Selling costs (in hundredths)	0.00%
Holding period	0 months
Impaired Loans [Member] \| Appraised Collateral Values [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal (in hundredths)	20.00%
Selling costs (in hundredths)	10.00%
Holding period	18 months
Other Real Estate Owned [Member] \| Appraised Collateral Values [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 501	$ 616
Valuation Technique(s)	Appraised Collateral Values
Other Real Estate Owned [Member] \| Appraised Collateral Values [Member] \| Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal (in hundredths)	0.00%
Selling costs (in hundredths)	0.00%
Other Real Estate Owned [Member] \| Appraised Collateral Values [Member] \| Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount for time since appraisal (in hundredths)	20.00%
Selling costs (in hundredths)	10.00%
Holding period	18 months

Holding period, used as an input to measure fair value.

No definition available.

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

- Definition

Percentage of selling costs, used as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	czfs_FairValueInputsSellingCosts
Namespace Prefix:	czfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_AssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of adjustment to the observed price for a similar asset or liability when an identical transaction does not exist, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsComparabilityAdjustments
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementsValuationTechniques
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration