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Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Related Party Transactions [Abstract] |  |
Aggregate of loans total | $ 2,570 us-gaap_RelatedPartyTransactionDueFromToRelatedParty | $ 2,238 us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Payments to fund long-term loans to related parties | 1,087 us-gaap_PaymentsToFundLongtermLoansToRelatedParties |
Repayment total | 398 ccne_PaymentMadeToRelatedParties |
Loans added due to change in the composition of related parties | 357 ccne_PaymentsForAdditionalLoanToRelatedParty |
Deposits | $ 46,964 ccne_DepositsReceivedFromRelatedParties | $ 48,249 ccne_DepositsReceivedFromRelatedParties

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- Definition Deposits received from related parties. + References No definition available. + Details
Name: | ccne_DepositsReceivedFromRelatedParties
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Payment made to related parties. + References No definition available. + Details
Name: | ccne_PaymentMadeToRelatedParties
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments for additional loan to related party. + References No definition available. + Details
Name: | ccne_PaymentsForAdditionalLoanToRelatedParty
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates. + References No definition available. + Details
Name: | us-gaap_PaymentsToFundLongtermLoansToRelatedParties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 1 -Article 4 + Details
Name: | us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration