No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

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Period Type:	duration

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

+ Details

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

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

+ Details

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

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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Loans, Trouble Debt Restructuring (Details) $ in Thousands	3 Months Ended
Loans, Trouble Debt Restructuring (Details) $ in Thousands	Mar. 31, 2022 USD ($) Contract	Mar. 31, 2021 USD ($) Contract	Dec. 31, 2021 USD ($)
Loans [Abstract]
Reserves of allowance for loan losses \| $	$ 26		$ 26
Number of contract loan modifications considered TDRs	0
Financing receivable modifications [Abstract]
Number of contracts	0
Interest Modification [Member]
Loans [Abstract]
Number of contract loan modifications considered TDRs		0
Financing receivable modifications [Abstract]
Number of contracts		0
Pre-modification outstanding recorded investment \| $		$ 0
Post-modification outstanding recorded investment \| $		$ 0
Term Modification [Member]
Loans [Abstract]
Number of contract loan modifications considered TDRs		2
Financing receivable modifications [Abstract]
Number of contracts		2
Pre-modification outstanding recorded investment \| $		$ 290
Post-modification outstanding recorded investment \| $		$ 290
Real Estate Loans [Member] \| Commercial [Member] \| Interest Modification [Member]
Loans [Abstract]
Number of contract loan modifications considered TDRs		0
Financing receivable modifications [Abstract]
Number of contracts		0
Pre-modification outstanding recorded investment \| $		$ 0
Post-modification outstanding recorded investment \| $		$ 0
Real Estate Loans [Member] \| Commercial [Member] \| Term Modification [Member]
Loans [Abstract]
Number of contract loan modifications considered TDRs		2
Financing receivable modifications [Abstract]
Number of contracts		2
Pre-modification outstanding recorded investment \| $		$ 290
Post-modification outstanding recorded investment \| $		$ 290