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LOANS - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Market Rate Adjustment |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | $ (885) | $ 352 | $ (637) | $ 718
Accretion (amortization) recognized in interest income | 19 | (357) | (229) | (723)
Adjustments to gross amortized cost of loans at end of period | (866) | (5) | (866) | (5)
Credit Adjustment on Non-impaired Loans |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | (2,782) | (5,182) | (3,335) | (5,979)
Accretion (amortization) recognized in interest income | 379 | 680 | 932 | 1,477
Adjustments to gross amortized cost of loans at end of period | $ (2,403) | $ (4,502) | $ (2,403) | $ (4,502)

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
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: |