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Note 8 - Loans - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Market Rate Adjustment [Member]
Adjustments to gross amortized cost of loans at acquisition	$ (1,807)
Accretion recognized in interest income	392
Recovery from PCI loan pay-off
Adjustments to gross amortized cost of loans at December 31, 2019	(1,415)
Credit Adjustment on Non-impaired Loans [Member]
Adjustments to gross amortized cost of loans at acquisition	(1,914)
Accretion recognized in interest income	698
Recovery from PCI loan pay-off
Adjustments to gross amortized cost of loans at December 31, 2019	(1,216)
Credit Adjustment on PCI Loans [Member]
Adjustments to gross amortized cost of loans at acquisition	(318)
Accretion recognized in interest income
Recovery from PCI loan pay-off	10
Adjustments to gross amortized cost of loans at December 31, 2019	$ (308)

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:	duration

X

- Definition

Amount of recovery in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

+ References

No definition available.

+ Details

Name:	cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesRecovery
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of total adjustment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

+ References

No definition available.

+ Details

Name:	cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesTotalAdjustment
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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:

X

- Details

Name:	us-gaap_CreditLossStatusAxis=cznc_CreditAdjustmentOnPCILoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: