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Secondary Market Mortgage Activities - Summary of Activity for Capital Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mortgage Banking [Abstract] |  |  |
Balance, beginning of year | $ 904 ccne_CapitalizedMortgageServicingRights | $ 714 ccne_CapitalizedMortgageServicingRights | $ 906 ccne_CapitalizedMortgageServicingRights
Additions | 240 us-gaap_PaymentsToAcquireMortgageServicingRightsMSR | 350 us-gaap_PaymentsToAcquireMortgageServicingRightsMSR | 85 us-gaap_PaymentsToAcquireMortgageServicingRightsMSR
Servicing rights acquired | 0 us-gaap_ServicingAssetAtAmortizedValueAdditions | 83 us-gaap_ServicingAssetAtAmortizedValueAdditions | 0 us-gaap_ServicingAssetAtAmortizedValueAdditions
Amortization | (288)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (243)us-gaap_AmortizationOfMortgageServicingRightsMSRs | (277)us-gaap_AmortizationOfMortgageServicingRightsMSRs
Balance, end of year | $ 856 ccne_CapitalizedMortgageServicingRightsEndingBalance | $ 904 ccne_CapitalizedMortgageServicingRightsEndingBalance | $ 714 ccne_CapitalizedMortgageServicingRightsEndingBalance

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- Definition Capitalized mortgage servicing rights. + References No definition available. + Details
Name: | ccne_CapitalizedMortgageServicingRights
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Capitalized mortgage servicing rights ending balance. + References No definition available. + Details
Name: | ccne_CapitalizedMortgageServicingRightsEndingBalance
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
Name: | us-gaap_AmortizationOfMortgageServicingRightsMSRs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The cash outflow to obtain servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 + Details
Name: | us-gaap_PaymentsToAcquireMortgageServicingRightsMSR
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
Name: | us-gaap_ServicingAssetAtAmortizedValueAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration