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Loans - Restructured in Troubled Debt (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 Loans | Dec. 31, 2013 Loans
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 12 | 12
Loans Balance | $ 11,945 | $ 12,136
Specific Reserve | 1,380 | 1,455
Commercial, Industrial, and Agricultural [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 5 | 5
Loans Balance | 1,745 | 1,790
Specific Reserve | 113 | 115
Commercial Mortgages [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 7 | 7
Loans Balance | 10,200 | 10,346
Specific Reserve | 1,267 | 1,340
Residential Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0
Loans Balance | 0 | 0
Specific Reserve | 0 | 0
Consumer [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0
Loans Balance | 0 | 0
Specific Reserve | 0 | 0
Credit Cards [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Loans | 0 | 0
Loans Balance | 0 | 0
Specific Reserve | $ 0 | $ 0

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- Definition Financing receivable modifications specific reserve. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant