The fair value of trust assets under management.

No definition available.

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

- Definition

Estimate weighted-average remaining life of financing receivable.

+ References

No definition available.

+ Details

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

- Definition

The forecast period as forward-looking information that is both reasonable and supportable and relevant to the collectability of cash flows of financing receivable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

- Definition

The threshold amount of financing receivables for credit losses review that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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

- 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

Name:	cznc_NonaccrualLoansToAccrualStatusContractualPerformancePeriod
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

Name:	cznc_TrustRevenueEarnedAndCollectedMonthlyPercent
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
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

+ Details

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

- Definition

Amount of interest income from financing receivable before allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (a)
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (b)
-Subparagraph (1)
-Publisher SEC

+ Details

Name:	us-gaap_InterestIncomeFinancingReceivableBeforeAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 946
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480833/946-310-45-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_InterestReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-18

+ Details

Name:	us-gaap_NumberOfReportableSegments
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
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-15

+ Details

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

- Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
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:

NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)		1 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($)	Jan. 31, 2023	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)
Number of reportable segments \| segment			1
Contractual performance period of nonaccrual loans to be restored to accrual status			6 months
Credit losses related to unfunded loan commitments	$ 19,208,000		$ 19,208,000	$ 16,615,000
Interest receivable	$ 2,018,000		2,018,000
Interest receivable excluded from the estimate of credit losses			$ 7,099,000
Weighted-average remaining life of the entire portfolio	4 years 5 months 23 days	4 years 4 months 9 days
Forecast relevant to collectability of cash flows			2 years
Accrued interest related to unrecognized tax benefits	$ 0		$ 0
Fair value of trust assets under management	1,188,082,000		$ 1,188,082,000	1,063,615,000
Trust revenue is earned and collected monthly			81.00%
Commercial
Credit losses related to unfunded loan commitments				11,298,000
Threshold amount of financing receivables for credit losses	200,000		$ 200,000
Residential mortgage
Credit losses related to unfunded loan commitments				4,073,000
Threshold amount of financing receivables for credit losses	400,000		400,000
Consumer
Credit losses related to unfunded loan commitments				$ 244,000
Threshold amount of financing receivables for credit losses	$ 400,000		$ 400,000