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BUSINESS COMBINATIONS - Covenant Financial Loans Fair Value Adjustments (Details) - Covenant Financial Inc. $ in Thousands	Jul. 01, 2020 USD ($)
BUSINESS COMBINATIONS
Gross amortized cost at acquisition	$ 472,012
Fair value adjustments:
Market rates	2,909
Credit adjustment on non-impaired loans	(7,219)
Credit adjustment on impaired loans	(3,466)
Fair value at acquisition	$ 464,236

X

- Definition

For impaired loans acquired in a business combination, this element represents the best estimate at the acquisition date of the credit adjustment.

+ References

No definition available.

+ Details

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Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

For loans acquired in a business combination, this element represents the best estimate at the acquisition date of the fair value adjustment due to market rates.

+ References

No definition available.

+ Details

Name:	cznc_BusinessCombinationAcquiredLoansFairValueAdjustmentMarketRates
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For non-impaired loans acquired in a business combination, this element represents the best estimate at the acquisition date of the credit adjustment.

+ References

No definition available.

+ Details

Name:	cznc_BusinessCombinationAcquiredNonImpairedLoansFairValueAdjustmentCredit
Namespace Prefix:	cznc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- 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_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=cznc_CovenantFinancialIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: