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DEPOSITS - Remaining Maturities of Time Deposits In Excess of 250,000 (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
DEPOSITS |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 175,447,000 | $ 134,085,000
Three months or less | 38,392,000 |
Over 3 months through 12 months | 83,209,000 |
Over 1 year through 3 years | 53,446,000 |
Over 3 years | 400,000 |
Total | $ 175,447,000 | $ 134,085,000

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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

X
- 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

X
- 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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478353/942-405-50-1 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant