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Note 9 - Bank Premises and Equipment - Depreciation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Depreciation expense | $ 1,749 | $ 1,754
Occupancy Expense [Member] |  |
Depreciation expense | 775 | 849
Furniture and Fixtures Expense [Member] |  |
Depreciation expense | 692 | 684
Data Processing [Member] |  |
Depreciation expense | 239 | 183
Telecommunications Expense [Member] |  |
Depreciation expense | $ 43 | $ 38

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- Definition The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_DepreciationNonproduction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_NatureOfExpenseAxis=cznc_OccupancyExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_NatureOfExpenseAxis=cznc_FurnitureAndFixturesExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_NatureOfExpenseAxis=cznc_DataProcessingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_NatureOfExpenseAxis=cznc_TelecommunicationsExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |