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Note 3 - Business Combination and Pending Acquisition - Monument Bancorp, Inc. - Fair Value Adjustments on Loans Acquired (Details) - Monument Bancorp, Inc [Member] | Apr. 01, 2019 USD ($)
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Gross amortized cost at acquisition | $ 263,334,000
Market rate adjustment | (1,807,000)
Credit fair value adjustment on non-credit impaired loans (accretable) | (1,914,000)
Credit fair value adjustment on impaired loans (non-accretable) | (318,000)
Estimated fair value of acquired loans | $ 259,295,000

X
- Definition Represents the credit fair value adjustment on credit impaired loans at the acquisition date. + References No definition available. + Details
Name: | cznc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCreditFairValueAdjustmentOnImpairedLoans
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the credit fair value adjustment on non-credit impaired loans at the acquisition date. + References No definition available. + Details
Name: | cznc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCreditFairValueAdjustmentOnNonCreditImpairedLoans
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of loans receivable acquired at the acquisition date. + References No definition available. + Details
Name: | cznc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivable
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the gross amortized cost on loans receivable at the acquisition date. + References No definition available. + Details
Name: | cznc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivableGrossAmortizedCost
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the market rate adjustment on loans receivable at the acquisition date. + References No definition available. + Details
Name: | cznc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansReceivableMarketRateAdjustment
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cznc_MonumentBancorpIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |