XML 81 R70.htm IDEA: XBRL DOCUMENT
v3.24.3

FAIR VALUE MEASUREMENTS AND FAIR VALUES OF FINANCIAL INSTRUMENTS - Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets Measured at Fair Value |  |
Total, fair value | $ 408,422 | $ 415,755
Interest rate swap agreements |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 1,991 | 2,783
Fair value of the derivative liability | 1,991 | 2,783
RPA In |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 0 | 0
Fair value of the derivative liability | 9 | 13
Obligations of the U.S. Treasury |  |
Assets Measured at Fair Value |  |
Total, fair value | 7,321 | 11,290
Obligations of U.S. Government agencies |  |
Assets Measured at Fair Value |  |
Total, fair value | 9,376 | 9,946
Bank holding company debt securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 23,949 | 23,500
Obligations Of States And Political Subdivisions Tax Exempt |  |
Assets Measured at Fair Value |  |
Total, fair value | 104,936 | 104,199
Obligations Of States And Political Subdivisions Taxable |  |
Assets Measured at Fair Value |  |
Total, fair value | 48,434 | 50,111
Residential Passthrough Securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 94,053 | 95,405
Residential Collateralized Mortgage Obligations |  |
Assets Measured at Fair Value |  |
Total, fair value | 45,601 | 46,462
Commercial Mortgage Backed Securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 66,390 | 66,682
Private label commercial mortgage-backed securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 8,362 | 8,160
Recurring fair value measurements |  |
Assets Measured at Fair Value |  |
Total, fair value | 408,422 | 415,755
Marketable equity security | 889 | 871
Servicing rights | 2,682 | 2,659
Total asset fair value measurements | 413,992 | 422,079
Fair value of the derivative liability | 2,000 | 2,796
Recurring fair value measurements | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 7,321 | 11,290
Marketable equity security | 889 | 871
Servicing rights | 0 | 0
Total asset fair value measurements | 8,210 | 12,161
Fair value of the derivative liability | 0 | 0
Recurring fair value measurements | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 401,101 | 404,465
Marketable equity security | 0 | 0
Servicing rights | 0 | 0
Total asset fair value measurements | 403,100 | 407,259
Fair value of the derivative liability | 2,000 | 2,796
Recurring fair value measurements | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Marketable equity security | 0 | 0
Servicing rights | 2,682 | 2,659
Total asset fair value measurements | 2,682 | 2,659
Fair value of the derivative liability | 0 | 0
Recurring fair value measurements | RPA Out |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 8 | 11
Recurring fair value measurements | RPA Out | Level 1 |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 0 | 0
Recurring fair value measurements | RPA Out | Level 2 |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 8 | 11
Recurring fair value measurements | RPA Out | Level 3 |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 0 | 0
Recurring fair value measurements | Interest rate swap agreements |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 1,991 | 2,783
Fair value of the derivative liability | 1,991 | 2,783
Recurring fair value measurements | Interest rate swap agreements | Level 1 |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 0 | 0
Fair value of the derivative liability | 0 | 0
Recurring fair value measurements | Interest rate swap agreements | Level 2 |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 1,991 | 2,783
Fair value of the derivative liability | 1,991 | 2,783
Recurring fair value measurements | Interest rate swap agreements | Level 3 |  |
Assets Measured at Fair Value |  |
Fair value derivative asset | 0 | 0
Fair value of the derivative liability | 0 | 0
Recurring fair value measurements | RPA In |  |
Assets Measured at Fair Value |  |
Fair value of the derivative liability | 9 | 13
Recurring fair value measurements | RPA In | Level 1 |  |
Assets Measured at Fair Value |  |
Fair value of the derivative liability | 0 | 0
Recurring fair value measurements | RPA In | Level 2 |  |
Assets Measured at Fair Value |  |
Fair value of the derivative liability | 9 | 13
Recurring fair value measurements | RPA In | Level 3 |  |
Assets Measured at Fair Value |  |
Fair value of the derivative liability | 0 | 0
Recurring fair value measurements | Obligations of the U.S. Treasury |  |
Assets Measured at Fair Value |  |
Total, fair value | 7,321 | 11,290
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 7,321 | 11,290
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations of the U.S. Treasury | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations of U.S. Government agencies |  |
Assets Measured at Fair Value |  |
Total, fair value | 9,376 | 9,946
Recurring fair value measurements | Obligations of U.S. Government agencies | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations of U.S. Government agencies | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 9,376 | 9,946
Recurring fair value measurements | Obligations of U.S. Government agencies | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Bank holding company debt securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 23,949 | 23,500
Recurring fair value measurements | Bank holding company debt securities | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Bank holding company debt securities | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 23,949 | 23,500
Recurring fair value measurements | Bank holding company debt securities | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt |  |
Assets Measured at Fair Value |  |
Total, fair value | 104,936 | 104,199
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 104,936 | 104,199
Recurring fair value measurements | Obligations Of States And Political Subdivisions Tax Exempt | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable |  |
Assets Measured at Fair Value |  |
Total, fair value | 48,434 | 50,111
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 48,434 | 50,111
Recurring fair value measurements | Obligations Of States And Political Subdivisions Taxable | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Residential Passthrough Securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 94,053 | 95,405
Recurring fair value measurements | Residential Passthrough Securities | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Residential Passthrough Securities | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 94,053 | 95,405
Recurring fair value measurements | Residential Passthrough Securities | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Residential Collateralized Mortgage Obligations |  |
Assets Measured at Fair Value |  |
Total, fair value | 45,601 | 46,462
Recurring fair value measurements | Residential Collateralized Mortgage Obligations | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Residential Collateralized Mortgage Obligations | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 45,601 | 46,462
Recurring fair value measurements | Residential Collateralized Mortgage Obligations | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Commercial Mortgage Backed Securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 66,390 | 66,682
Recurring fair value measurements | Commercial Mortgage Backed Securities | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Commercial Mortgage Backed Securities | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 66,390 | 66,682
Recurring fair value measurements | Commercial Mortgage Backed Securities | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Private label commercial mortgage-backed securities |  |
Assets Measured at Fair Value |  |
Total, fair value | 8,362 | 8,160
Recurring fair value measurements | Private label commercial mortgage-backed securities | Level 1 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Recurring fair value measurements | Private label commercial mortgage-backed securities | Level 2 |  |
Assets Measured at Fair Value |  |
Total, fair value | 8,362 | 8,160
Recurring fair value measurements | Private label commercial mortgage-backed securities | Level 3 |  |
Assets Measured at Fair Value |  |
Total, fair value | 0 | 0
Nonrecurring fair value measurements |  |
Assets Measured at Fair Value |  |
Total asset fair value measurements | 1,630 | 7,521
Impaired loans, net | 1,449 | 7,043
Foreclosed assets held for sale | 181 | 478
Nonrecurring fair value measurements | Level 1 |  |
Assets Measured at Fair Value |  |
Total asset fair value measurements | 0 | 0
Impaired loans, net | 0 | 0
Foreclosed assets held for sale | 0 | 0
Nonrecurring fair value measurements | Level 2 |  |
Assets Measured at Fair Value |  |
Total asset fair value measurements | 0 | 0
Impaired loans, net | 0 | 0
Foreclosed assets held for sale | 0 | 0
Nonrecurring fair value measurements | Level 3 |  |
Assets Measured at Fair Value |  |
Total asset fair value measurements | 1,630 | 7,521
Impaired loans, net | 1,449 | 7,043
Foreclosed assets held for sale | $ 181 | $ 478

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References No definition available. + Details
Name: | cznc_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment1
Namespace Prefix: | cznc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 55 -Paragraph 8 -SubTopic 20 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-8 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5C -Subparagraph (SX 210.12-13C(Column F)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5C Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 5B -Subparagraph (SX 210.12-13B(Column E)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-5B + Details
Name: | us-gaap_DerivativeAssetFairValueGrossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-22 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-7 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 4D -Subparagraph (c)(2) -SubTopic 20 -Topic 860 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4D + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11 + Details
Name: | us-gaap_RealEstateAcquiredThroughForeclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481260/860-50-45-2 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cznc_RiskParticipationAgreementsInMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_U.s.TreasuryDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_BankHoldingCompanyDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_ObligationsOfStatesAndPoliticalSubdivisionsTaxExemptMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_ObligationsOfStatesAndPoliticalSubdivisionsTaxableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_ResidentialPassthroughSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_ResidentialCollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=cznc_PrivateLabelCommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=cznc_RiskParticipationAgreementOutMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |