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FEDERAL HOME LOAN BANK (FHLB) STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
FEDERAL HOME LOAN BANK (FHLB) STOCK [Abstract]
Federal home loan bank stock	$ 6,021	$ 4,542
FHLB Stock, at par value (in dollars per share)	$ 100

X

- Definition

This elements represents face amount of Federal Home Loan Bank Stock per share, generally not indicative of the fair market value per share.

+ References

No definition available.

+ Details

Name:	czfs_FederalHomeLoanBankStockParValue
Namespace Prefix:	czfs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 325
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809

+ Details

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

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- References

No definition available.

+ Details

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