Name:	cznc_CapitalRequiredForCapitalAdequacyIncludingConservationBuffer
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action including the capital conservation buffer.

No definition available.

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Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The amount of Total Capital required to be categorized as well as capitalized under the corporation's policy thresholds.

No definition available.

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Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The Total risk based capital ratio (total capital divided by risk weighted assets) required to meet the corporation's policy thresholds.

No definition available.

Name:	cznc_CapitalRequiredToMeetTheCorporationsPolicyThresholdsToRiskWeightedAssets
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The minimum amount of Common Equity Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action including capital conservation buffer.

No definition available.

Name:	cznc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyIncludingCapitalConservationBuffer
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum Common Equity Tier 1 Risk Based Capital Ratio (Common Equity Tier 1 Capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

No definition available.

Name:	cznc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
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No definition available.

Name:	cznc_CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsIncludingCapitalConservationBuffer
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
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Period Type:	instant

The Common Equity Tier 1 Risk Based Capital ratio (Common Equity Tier 1 Capital divided by risk-weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

No definition available.

Name:	cznc_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAsset
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The minimum amount of Common Equity Tier 1 Risk Based Capital required to meet the Corporation's policy thresholds.

No definition available.

Name:	cznc_CommonEquityTierOneRiskBasedCapitalRequiredToMeetTheCorporationsPolicyThresholds
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum Common Equity Tier 1 Risk Based Capital Ratio (Common Equity Tier 1 Capital divided by risk-weighted assets) required to meet the Corporation's policy thresholds.

No definition available.

Name:	cznc_CommonEquityTierOneRiskBasedCapitalRequiredToMeetTheCorporationsPolicyThresholdsToRiskWeightedAssets
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The minimum amount of Tier 1 Risk Based Capital required for to meet the corporation's policy thresholds.

No definition available.

Name:	cznc_TierOneCapitalRequiredToMeetTheCorporationsPolicyThresholds
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required to meet the corporation's policy thresholds.

No definition available.

Name:	cznc_TierOneCapitalRequiredToMeetTheCorporationsPolicyThresholdsToRiskWeightedAssets
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The minimum amount of Tier 1 Leverage Capital required to meet Corporation's policy threshold.

No definition available.

Name:	cznc_TierOneLeverageCapitalRequiredToMeetCorporationsPolicyThreshold
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum amount of Tier 1 Leverage Capital to meet Corporation's policy threshold divided by average assets as defined in the regulations.

No definition available.

Name:	cznc_TierOneLeverageCapitalRequiredToMeetCorporationsPolicyThresholdToAverageAssets
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action including the conservation buffer.

No definition available.

Name:	cznc_TierOneRiskBasedCapitalRequiredForCapitalAdequacyIncludingConservationBuffer
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action including the capital conservation buffer.

No definition available.

Name:	cznc_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsIncludingCapitalConservationBuffer
Namespace Prefix:	cznc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Amount of total capital as defined by regulatory framework.

Name:	us-gaap_Capital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

Name:	us-gaap_CapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

Name:	us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Period Type:	instant

Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework.

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

Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Amount of minimum Common Equity Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

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Amount of minimum Common Equity Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Namespace Prefix:	us-gaap_
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Period Type:	instant

Amount of Tier 1 leverage capital as defined by regulatory framework.

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

Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

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

Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Amount of minimum Tier 1 leverage capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix:	us-gaap_
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Ratio of Tier 1 capital to average assets as defined by regulatory framework.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Amount of Tier 1 risk-based capital as defined by regulatory framework.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Amount of minimum Tier 1 risk-based capital required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.