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LOANS - Adjustments to Initial Discounts and Carrying Amounts of Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Market Rate Adjustment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Adjustments to gross amortized cost of loans, Beginning balance | $ (1,103) | $ (1,658) | $ (1,415) | $ 0
Adjustment recorded in acquisition | 2,909 | 0 | 2,909 | (1,807)
Accretion recognized in interest income | (452) | 110 | (140) | 259
Adjustments to gross amortized cost of loans, Ending balance | 1,354 | (1,548) | 1,354 | (1,548)
Credit Adjustment on Non-impaired Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Adjustments to gross amortized cost of loans, Beginning balance | (878) | (1,653) | (1,216) | 0
Adjustment recorded in acquisition | (7,219) | 0 | (7,219) | (1,914)
Accretion recognized in interest income | 970 | 260 | 1,308 | 521
Adjustments to gross amortized cost of loans, Ending balance | $ (7,127) | $ (1,393) | $ (7,127) | $ (1,393)

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

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