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v3.20.2

LOANS - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Market Rate Adjustment |  |  |  |
Adjustments to gross amortized cost of loans, Beginning balance | $ (1,268) | $ 0 | $ (1,415) | $ 0
Adjustment recorded in acquisition | 0 | (1,807) | 0 | (1,807)
Accretion recognized in interest income | 165 | 149 | 312 | 149
Adjustments to gross amortized cost of loans, Ending balance | (1,103) | (1,658) | (1,103) | (1,658)
Credit Adjustment on Non-impaired Loans |  |  |  |
Adjustments to gross amortized cost of loans, Beginning balance | (1,011) | 0 | (1,216) | 0
Adjustment recorded in acquisition | 0 | (1,914) | 0 | (1,914)
Accretion recognized in interest income | 133 | 261 | 338 | 261
Adjustments to gross amortized cost of loans, Ending balance | $ (878) | $ (1,653) | $ (878) | $ (1,653)

X
- Definition Amount of accretion recognized in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
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Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of adjustment recorded in acquisition acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
Name: | cznc_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquisition
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of adjustment to cost recognized in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality. + References No definition available. + Details
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Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditLossStatusAxis=cznc_CreditAdjustmentOnNonimpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |