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v3.19.3.a.u2

Note 8 - Loans - Special Mention Loans (Details) (Parentheticals) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Asset Originated [Member] |  |
Number of loans | 2 |
Special Mention [Member] |  |
Number of loans |  | 53
Substandard [Member] |  |
Number of loans | 225 | 215
Loans Downgraded [Member] | Pass [Member] |  |
Number of loans | 4 |
No Change in Rating [Member] | Special Mention [Member] |  |
Number of loans | 1 |
Loans Upgraded [Member] | Substandard [Member] |  |
Number of loans | 2 |

X
- Definition Represents the number of loans as of the specified date. + References No definition available. + Details
Name: | cznc_NumberOfLoans
Namespace Prefix: | cznc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetOriginatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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