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Note 8 - Loans - Contractual Aging of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Nonaccrual loans	$ 9,218	$ 13,113
Non accrual Loans [Member]
Loans current and past due, nonaccrual	3,840	5,793
Nonaccrual loans	9,218	13,113
Non accrual Loans [Member] | Financing Receivables 30 to 89 Days Past Due [Member]
Nonaccrual loans	1,134	1,166
Non accrual Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Nonaccrual loans	$ 4,244	$ 6,154

X

- Definition

Recorded investment in financing receivables that are on nonaccrual status and are current or past due less than 30 days.

+ References

No definition available.

+ Details

Name:	cznc_FinancingReceivableRecordedInvestmentNonaccrualStatusCurrentAndPastDueLessThan30Days
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

+ Details

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

X

- Details

Name:	us-gaap_LoanRestructuringModificationAxis=cznc_NonAccrualLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=cznc_FinancingReceivables30To89DaysPastDueMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: