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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Market Rate Adjustment |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans, Beginning balance | $ 352 | $ (1,268) | $ 718 | $ (1,415)
(Amortization) accretion recognized in interest income | (357) | 165 | (723) | 312
Adjustments to gross amortized cost of loans, Ending balance | (5) | (1,103) | (5) | (1,103)
Credit Adjustment on Non-impaired Loans |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans, Beginning balance | (5,182) | (1,011) | (5,979) | (1,216)
(Amortization) accretion recognized in interest income | 680 | 133 | 1,477 | 338
Adjustments to gross amortized cost of loans, Ending balance | $ (4,502) | $ (878) | $ (4,502) | $ (878)

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: | instant

X
- 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: |