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v2.4.1.9

Premises and Equipment - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Renewal_Terms | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Depreciation on premises and equipment | $ 2,659 us-gaap_Depreciation | $ 2,147 us-gaap_Depreciation | $ 1,948 us-gaap_Depreciation
Rental expense, net of rental income | 736 ccne_RentalExpenseNetOfRentalIncome | 490 ccne_RentalExpenseNetOfRentalIncome | 351 ccne_RentalExpenseNetOfRentalIncome
Sale leaseback transaction, lease term | 17 years |  |
Sale leaseback transaction, number of automatic renewals | 2 ccne_SaleLeasebackTransactionAutomaticRenewalsNumber |  |
Sale leaseback transaction, two automatic lease renewal, period | 5 years |  |
Sale leaseback transaction, sale of property, amount | 1,200 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities |  |
Sale leaseback transaction, deferred gain | 489 us-gaap_SaleLeasebackTransactionDeferredGainNet |  |
Sale leaseback transaction, gain recognized | 19 us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized | 17 us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized | 19 us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Facilities [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non cancelable operating leases having remaining term less than one year | 23 ccne_NonCancelableOperatingLeasesHavingRemainingTermLessThanOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = ccne_FacilitiesMember |  |
Vehicles [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Non cancelable operating leases having remaining term less than one year | 9 ccne_NonCancelableOperatingLeasesHavingRemainingTermLessThanOneYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember |  |
Capital Addition Purchase Commitments [Member] | Clearfield, Pennsylvania [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Contractual commitment to construct / remodel the facility | 2,734 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = us-gaap_CapitalAdditionsMember / us-gaap_StatementGeographicalAxis = ccne_ClearfieldPennsylvaniaMember |  |
Construction-related expenditures | 1,740 ccne_LongTermPurchaseCommitmentCostsIncurredToDate / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = us-gaap_CapitalAdditionsMember / us-gaap_StatementGeographicalAxis = ccne_ClearfieldPennsylvaniaMember |  |
Capital Addition Purchase Commitments [Member] | Erie, Pennsylvania [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Contractual commitment to construct / remodel the facility | 1,445 us-gaap_LongTermPurchaseCommitmentAmount / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = us-gaap_CapitalAdditionsMember / us-gaap_StatementGeographicalAxis = ccne_EriePennsylvaniaMember |  |
Construction-related expenditures | $ 1,360 ccne_LongTermPurchaseCommitmentCostsIncurredToDate / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = us-gaap_CapitalAdditionsMember / us-gaap_StatementGeographicalAxis = ccne_EriePennsylvaniaMember |  |

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- Definition Long term purchase commitment costs incurred to date. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Non cancelable operating leases having remaining term less than one year. + References No definition available. + Details
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- Definition Rental expense net of rental income. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sale leaseback transaction automatic renewals number. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Sale leaseback transaction lease period. + References No definition available. + Details
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Balance Type: | na
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- Definition Sale leaseback transaction lease renewal period. + References No definition available. + Details
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Balance Type: | na
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X
- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
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- Definition Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + Details
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- Details
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- Details
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- Details
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