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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

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- Definition The amount of loans and leases receivable with balances greater than $500,000. + References No definition available. + Details
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Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |