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LOANS - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Market Rate Adjustment |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | $ (5) | $ (1,103) | $ 718 | $ (1,415)
Adjustment recorded in acquisition | 0 | 2,909 | 0 | 2,909
(Amortization) accretion recognized in interest income | (368) | (452) | (1,091) | (140)
Adjustments to gross amortized cost of loans at end of period | (373) | 1,354 | (373) | 1,354
Credit Adjustment on Non-impaired Loans |  |  |  |
LOANS |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | (4,502) | (878) | (5,979) | (1,216)
Adjustment recorded in acquisition | 0 | (7,219) | 0 | (7,219)
(Amortization) accretion recognized in interest income | 666 | 970 | 2,143 | 1,308
Adjustments to gross amortized cost of loans at end of period | $ (3,836) | $ (7,127) | $ (3,836) | $ (7,127)

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 recorded in acquisition acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquisition
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: | 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
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Namespace Prefix: | us-gaap_
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Period Type: | duration

X
- Details
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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: |