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DEPOSITS - Remaining Maturities of Time Deposits In Excess of 250,000 (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
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DEPOSITS |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 75,375,000 | $ 103,024,000
Three months or less | 15,981,000 |
Over 3 months through 12 months | 32,648,000 |
Over 1 year through 3 years | 25,438,000 |
Over 3 years | 1,308,000 |
Total | $ 75,375,000 | $ 103,024,000

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more, maturing after three years from the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more, maturing within one to three years after the balance sheet date. + References No definition available. + Details
Name: | cznc_ContractualMaturitiesTimeDepositsAtOrAboveFDICInsuranceLimitSixMonthsThrough12Months
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more, maturing within three months or fewer from the balance sheet date. + References No definition available. + Details
Name: | cznc_ContractualMaturitiesTimeDepositsAtOrAboveFDICInsuranceLimitThreeMonthsOrLess
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations of $250,000 or more, maturing within three to twelve months after the balance sheet date. + References No definition available. + Details
Name: | cznc_ContractualMaturitiesTimeDepositsAtOrAboveFDICInsuranceLimitThreeMonthsThroughTwelveMonths
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | cznc_DepositsDisclosureAbstract
Namespace Prefix: | cznc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
Name: | us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant