No definition available.

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

- Definition

Carrying amount as of the balance sheet date of pending formal foreclosure proceedings on potential foreclosure assets.

+ References

No definition available.

+ Details

Name:	czfs_OtherRealEstateFormalForeclosureProceedingsForeclosedAssetsPending
Namespace Prefix:	czfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount of allowance for credit losses related to recorded investment in financing receivable categorized as troubled debt restructuring.

+ References

No definition available.

+ Details

Name:	czfs_TroubledDebtFinancingReceivableRelatedAllowance
Namespace Prefix:	czfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=czfs_InterestModificationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=czfs_TermModificationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=czfs_RealEstateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=czfs_ConsumerResidentialMortgagesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans, Trouble Debt Restructuring (Details)	3 Months Ended		9 Months Ended
Loans, Trouble Debt Restructuring (Details)	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($) Contract	Dec. 31, 2014 USD ($)
Loans [Abstract]
Reserves of allowance for loan losses	$ 39,000		$ 39,000		$ 26,000
Recidivism receivables [Abstract]
Total recidivism, Number of contracts \| Contract	0	0	0	1
Total recidivism, Recorded investment	$ 0	$ 0	$ 0	$ 483,000
Foreclosed assets held for sale [Abstract]
Foreclosed assets held for sale	$ 1,429,000		$ 1,429,000		$ 1,792,000
Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts \| Contract			1	0
Pre-modification Outstanding Recorded Investment			$ 71,000	$ 0
Post-Modification Outstanding Recorded Investment			$ 71,000	$ 0
Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts \| Contract			1	2
Pre-modification Outstanding Recorded Investment			$ 19,000	$ 153,000
Post-Modification Outstanding Recorded Investment			$ 19,000	$ 153,000
Real Estate Loans [Member] \| Mortgages [Member] \| Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts \| Contract			1
Pre-modification Outstanding Recorded Investment			$ 71,000
Post-Modification Outstanding Recorded Investment			$ 71,000
Real Estate Loans [Member] \| Mortgages [Member] \| Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts \| Contract			1
Pre-modification Outstanding Recorded Investment			$ 19,000
Post-Modification Outstanding Recorded Investment			$ 19,000
Real Estate Loans [Member] \| Commercial [Member]
Recidivism receivables [Abstract]
Total recidivism, Number of contracts \| Contract	0	0	0	1
Total recidivism, Recorded investment	$ 0	$ 0	$ 0	$ 483,000
Real Estate Loans [Member] \| Commercial [Member] \| Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts \| Contract				0
Pre-modification Outstanding Recorded Investment				$ 0
Post-Modification Outstanding Recorded Investment				$ 0
Real Estate Loans [Member] \| Commercial [Member] \| Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts \| Contract				2
Pre-modification Outstanding Recorded Investment				$ 153,000
Post-Modification Outstanding Recorded Investment				$ 153,000
Consumer Residential Mortgages [Member]
Foreclosed assets held for sale [Abstract]
Foreclosed assets held for sale	305,000		305,000
Formal foreclosure proceedings on potential foreclosure assets	$ 1,256,000		$ 1,256,000