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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Market Rate Adjustment |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |
Adjustments to gross amortized cost of loans at beginning of period | $ (970) | $ (916)
Accretion (amortization) recognized in interest income | 28 | (52)
Adjustments to gross amortized cost of loans at end of period | (942) | (968)
Credit Adjustment on Non-impaired Loans |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |
Adjustments to gross amortized cost of loans at beginning of period | (1,163) | (1,840)
Accretion (amortization) recognized in interest income | 115 | 198
Adjustments to gross amortized cost of loans at end of period | $ (1,048) | $ (1,642)

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
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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
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Period Type: | duration

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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_CreditLossStatusAxis=cznc_CreditAdjustmentOnNonimpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |