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Note 8 - Loans - Special Mention Loans (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Loans receivable	$ 1,182,222,000	$ 827,563,000
Financial Asset Originated [Member]
Loans receivable	4,135,000	0
Pass [Member]
Loans receivable	1,143,535,000	800,551,000
Pass [Member] | Loans Downgraded [Member]
Loans receivable	6,668,000	7,043,000
Special Mention [Member]
Loans receivable	19,658,000	7,394,000
Total Special Mention Loans of $500,000 or More at December 31, 2019	15,357,000	11,922,000
Special Mention [Member] | Financial Asset Originated [Member]
Loans receivable	3,500,000
Special Mention [Member] | No Change in Rating [Member]
Loans receivable	984,000	1,098,000
Substandard [Member]
Loans receivable	18,504,000	19,556,000
Total Special Mention Loans of $500,000 or More at December 31, 2019	4,185,000
Substandard [Member] | Loans Upgraded [Member]
Loans receivable	$ 3,570,000	$ 3,781,000

X

- Definition

The amount of loans and leases receivable with balances greater than $500,000.

+ References

No definition available.

+ Details

Name:	cznc_LoansAndLeasesReceivableBalancesGreaterThan500000
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

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