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LOANS - Loans Modified Under Covid-19 Program (Details) $ in Thousands	Sep. 30, 2020 USD ($) loan
LOANS
Loans Modified, Number of Loans | loan	44
Loans Modified, Recorded Investment | $	$ 41,639
Residential mortgage
LOANS
Loans Modified, Number of Loans | loan	16
Loans Modified, Recorded Investment | $	$ 1,727
Commercial
LOANS
Loans Modified, Number of Loans | loan	28
Loans Modified, Recorded Investment | $	$ 39,912

X

- Definition

Number of principal payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Deferred amounts of principal payments on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

No definition available.

+ Details

Name:	cznc_FinancingReceivablePrincipalDeferredPayments
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: