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DEPOSITS - Remaining Maturities of Time Deposits In Excess of $250,000 (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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DEPOSITS |  |
Time Deposits, at or Above FDIC Insurance Limit | $ 103,024,000 | $ 84,476,000
Three months or less | 25,566,000 |
Over 3 months through 12 months | 54,883,000 |
Over 1 year through 3 years | 15,574,000 |
Over 3 years | 7,001,000 |
Total | $ 103,024,000 | $ 84,476,000

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

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- References No definition available. + Details
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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
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Period Type: | instant