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Note 12 - Fair Value Measurements and Fair Values of Financial Instruments - Valuation Techniques and the Unobservable Inputs Used in Determining Fair Value - Recurring Basis (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Recurring [Member]
Fair value	$ 1,226,000	$ 1,277,000
Valuation Technique, Discounted Cash Flow [Member] | Servicing Rights Assets [Member]
Discount rate	12.50%	12.50%
Weighted-average PSA	213.00%	183.00%
Servicing fees of loan balances	0.25%	0.25%
Servicing fees of payments are late	4.00%	4.00%
Late fees assessed	5.00%	5.00%
Miscellaneous fees per account per month	$ 1,940	$ 1,940
Monthly servicing cost per account	6,000	6,000
Additional monthly servicing cost per loan on loans more than 30 days delinquent	$ 24,000	$ 24,000
Servicing costs of loans more than 30 days delinquent	1.50%	1.50%
Annual increase in servicing costs	3.00%	3.00%
Valuation Technique, Discounted Cash Flow [Member] | Fair Value, Recurring [Member]
Fair value	$ 1,226,000	$ 1,277,000

X

- Definition

The additional monthly servicing cost per loan for loans that are more than 30 days delinquent.

+ References

No definition available.

+ Details

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X

- Definition

Annual increase in servicing costs expressed as a percentage.

+ References

No definition available.

+ Details

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X

- Definition

Estimated miscellaneous servicing fees collected per account per month.

+ References

No definition available.

+ Details

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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

No definition available.

+ Details

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X

- Definition

Expense for monthly servicing costs per account per month.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of loans that are more than 30 days delinquent.

+ References

No definition available.

+ Details

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X

- Definition

Servicing fees associated with payments that are late.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
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X

- Definition

Servicing fees associated with loan balances.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
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X

- Definition

Servicing fees associated with late fees assessed.

+ References

No definition available.

+ Details

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X

- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value. Calculated as weighted-average PSA.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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