XML 162 R108.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Note 13 - Employee and Postretirement Benefit Plans - Fair Values of Pension Plan Assets (Details) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value of plan assets | 100.00% | 100.00%
Cash and Cash Equivalents [Member] |  |
Fair value of plan assets | 3.00% | 3.00%
Debt Securities [Member] |  |
Fair value of plan assets | 38.00% | 40.00%
Equity Securities [Member] |  |
Fair value of plan assets | 49.00% | 45.00%
Alternative Funds [Member] |  |
Fair value of plan assets | 10.00% | 12.00%

X
- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cznc_AlternativeFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |