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LOANS - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Market Rate Adjustment |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | $ (866) | $ (5) | $ (637) | $ 718
Accretion (amortization) recognized in interest income | 5 | (368) | (224) | (1,091)
Adjustments to gross amortized cost of loans at end of period | (861) | (373) | (861) | (373)
Credit Adjustment on Non-impaired Loans |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | (2,403) | (4,502) | (3,335) | (5,979)
Accretion (amortization) recognized in interest income | 308 | 666 | 1,240 | 2,143
Adjustments to gross amortized cost of loans at end of period | $ (2,095) | $ (3,836) | $ (2,095) | $ (3,836)

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: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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: |