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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Market Rate Adjustment |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | $ (968) | $ (885) | $ (916) | $ (637)
Accretion (amortization) recognized in interest income | (32) | 19 | (84) | (229)
Adjustments to gross amortized cost of loans at end of period | (1,000) | (866) | (1,000) | (866)
Credit Adjustment on Non-impaired Loans |  |  |  |
LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |  |  |
Adjustments to gross amortized cost of loans at beginning of period | (1,642) | (2,782) | (1,840) | (3,335)
Accretion (amortization) recognized in interest income | 196 | 379 | 394 | 932
Adjustments to gross amortized cost of loans at end of period | $ (1,446) | $ (2,403) | $ (1,446) | $ (2,403)

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

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- 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_
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Balance Type: | debit
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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