The fair value of trust assets under management.

No definition available.

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Balance Type:	debit
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- Definition

The amount of estimated loss on a financing receivable with relationships less than $200,000 in the aggregate which will trigger that financing receivable to be individually evaluated for impairment.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Threshold for determining if a financing receivable with an estimated loss of $100,000 or more, will be individually evaluated for impairment.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum loan period past due on a contractual basis to be generally charged off, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

The number of distinct loan segments in loan portfolio.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of contractual performance of nonaccrual loans restored to accrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percent of trust revenue earned and collected monthly.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599

+ Details

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

- Definition

Amount of interest expense accrued for an underpayment of income taxes.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_UnfundedLoanCommitmentMember
Namespace Prefix:
Data Type:	na
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NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Number of reportable segments \| segment	1
Contractual performance period of nonaccrual loans to be restored to accrual status	6 months
Minimum period past due to charge off loans	120 days
Number of distinct segments in loan portfolio \| segment	3
Credit losses related to unfunded loan commitments	$ 16,615,000	$ 13,537,000	$ 11,385,000	$ 9,836,000
Threshold amount of estimate loss for evaluating individual loans for impairment	100,000
Accrued interest related to unrecognized tax benefits	0
Fair value of trust assets under management	$ 1,063,615,000		1,232,919,000
Trust revenue is earned and collected monthly	83.00%
Commercial
Credit losses related to unfunded loan commitments	$ 11,298,000	8,293,000	6,308,000	4,788,000
Commercial \| Maximum
Threshold amount of loan balance for evaluating individual impairment loss	200,000
Residential mortgage
Credit losses related to unfunded loan commitments	4,073,000	4,338,000	4,253,000	4,182,000
Residential mortgage \| Maximum
Threshold amount of loan balance for evaluating individual impairment loss	400,000
Consumer
Credit losses related to unfunded loan commitments	244,000	235,000	$ 239,000	$ 281,000
Consumer \| Maximum
Threshold amount of loan balance for evaluating individual impairment loss	400,000
Unfunded Loan Commitment
Credit losses related to unfunded loan commitments	$ 0	$ 0