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Note 16 - Off-balance Sheet Risk - Standby Letters of Credit Expirations (Details) - Standby Letters of Credit [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
2020	$ 7,809
2021	523
2022	114
Total	$ 8,446	$ 7,227

X

- Definition

Represents the off-balance sheet risks expected over the next 12 months.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Off-balance sheet risks expected expirations in year three.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
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X

- Definition

Off-balance sheet risks expected expirations in year two.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- Details

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