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FEDERAL HOME LOAN BANK (FHLB) STOCK (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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FEDERAL HOME LOAN BANK (FHLB) STOCK [Abstract] |  |
Federal home loan bank stock | $ 4,593,000 | $ 6,087,000
FHLB Stock, at par value (in dollars per share) | $ 100 |

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- 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

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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