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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 ($)
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

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- 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

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- 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

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- 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: