LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES TDR (Details) (USD $)	12 Months Ended
Dec. 31, 2014 Contract	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract
LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES [Abstract]
Reserves of allowance for loan losses	$ 26,000	$ 28,000	$ 14,000
Recidivism receivables [Abstract]
Total recidivism, Number of contracts	1	2	1
Total recidivism, Recorded investment	50,000	61,000	50,000
Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	0	1	1
Pre-modification Outstanding Recorded Investment	0	72,000	48,000
Post-Modification Outstanding Recorded Investment	0	72,000	48,000
Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	2	4	5
Pre-modification Outstanding Recorded Investment	153,000	2,895,000	256,000
Post-Modification Outstanding Recorded Investment	153,000	2,895,000	256,000
Mortgages [Member] \| Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts		1	1
Pre-modification Outstanding Recorded Investment		72,000	48,000
Post-Modification Outstanding Recorded Investment		72,000	48,000
Mortgages [Member] \| Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts		0	1
Pre-modification Outstanding Recorded Investment		0	71,000
Post-Modification Outstanding Recorded Investment		0	71,000
Commercial [Member]
Recidivism receivables [Abstract]
Total recidivism, Number of contracts	1	1	1
Total recidivism, Recorded investment	50,000	55,000	50,000
Commercial [Member] \| Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	0	0	0
Pre-modification Outstanding Recorded Investment	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0
Commercial [Member] \| Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts	2	2	3
Pre-modification Outstanding Recorded Investment	153,000	1,365,000	160,000
Post-Modification Outstanding Recorded Investment	153,000	1,365,000	160,000
Other Commercial Loans [Member]
Recidivism receivables [Abstract]
Total recidivism, Number of contracts	0	1	0
Total recidivism, Recorded investment	0	6,000	0
Other Commercial Loans [Member] \| Interest Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts		0	0
Pre-modification Outstanding Recorded Investment		0	0
Post-Modification Outstanding Recorded Investment		0	0
Other Commercial Loans [Member] \| Term Modification [Member]
Financing receivable modifications [Abstract]
Number of contracts		2	1
Pre-modification Outstanding Recorded Investment		1,530,000	25,000
Post-Modification Outstanding Recorded Investment		$ 1,530,000	$ 25,000

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

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=35738203&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=35738203&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

- Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateOtherReceivableMember
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_FinancingReceivableTroubledDebtRestructuringAxis=czfs_InterestModificationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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