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Note 8 - Loans - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Market Rate Adjustment [Member] |
Adjustments to gross amortized cost of loans at acquisition | $ (1,807)
Accretion recognized in interest income | 392
Recovery from PCI loan pay-off |
Adjustments to gross amortized cost of loans at December 31, 2019 | (1,415)
Credit Adjustment on Non-impaired Loans [Member] |
Adjustments to gross amortized cost of loans at acquisition | (1,914)
Accretion recognized in interest income | 698
Recovery from PCI loan pay-off |
Adjustments to gross amortized cost of loans at December 31, 2019 | (1,216)
Credit Adjustment on PCI Loans [Member] |
Adjustments to gross amortized cost of loans at acquisition | (318)
Accretion recognized in interest income |
Recovery from PCI loan pay-off | 10
Adjustments to gross amortized cost of loans at December 31, 2019 | $ (308)

X
- Definition Amount of accretion recognized in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAccretion
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of adjustment to cost recognized in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAdjustmentToCost
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of recovery in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesRecovery
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of total adjustment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTotalAdjustment
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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