XML 170 R127.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Note 18 - Regulatory Matters - Payout Restrictions Based on the Capital Conservation Buffer (Details) | Dec. 31, 2019
--- | ---
Range One [Member] |
Maximum Payout | 60.00%
Range Two [Member] |
Maximum Payout | 40.00%
Range Three [Member] |
Maximum Payout | 20.00%
Range Four [Member] |
Maximum Payout | 0.00%

X
- Definition Represents the maximum payout as a percentage of eligible retained income. + References No definition available. + Details
Name: | cznc_MaximumPayoutAsAPercentageOfEligibleRetainedIncome
Namespace Prefix: | cznc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | cznc_CapitalConservationBufferRangeAxis=cznc_RangeOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cznc_CapitalConservationBufferRangeAxis=cznc_RangeTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cznc_CapitalConservationBufferRangeAxis=cznc_RangeThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cznc_CapitalConservationBufferRangeAxis=cznc_RangeFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |