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Note 8 - Loans - Special Mention Loans (Details) (Parentheticals)	Dec. 31, 2019	Dec. 31, 2018
Financial Asset Originated [Member]
Number of loans	2
Special Mention [Member]
Number of loans		53
Substandard [Member]
Number of loans	225	215
Loans Downgraded [Member] | Pass [Member]
Number of loans	4
No Change in Rating [Member] | Special Mention [Member]
Number of loans	1
Loans Upgraded [Member] | Substandard [Member]
Number of loans	2

X

- Definition

Represents the number of loans as of the specified date.

+ References

No definition available.

+ Details

Name:	cznc_NumberOfLoans
Namespace Prefix:	cznc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetOriginatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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