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Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Corporate notes and bonds [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Fair value | $ 1,980
Corporate notes and bonds [Member] | Constant prepayment rate [Member] | Discounted cash flow [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Input utilized one |
Corporate notes and bonds [Member] | Probability of default [Member] | Discounted cash flow [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Input utilized one |
Corporate notes and bonds [Member] | Discount rate [Member] | Discounted cash flow [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Input utilized one | 9.60%
Pooled trust preferred [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Fair value | $ 600
Pooled trust preferred [Member] | Discount rate [Member] | Discounted cash flow [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Input utilized one | 13.00%
Pooled trust preferred [Member] | Collateral Default Rate [Member] | Discounted cash flow [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Input utilized two | 2% annually for 2 years; 0.36% thereafter
Pooled trust preferred [Member] | Recovery probability [Member] | Discounted cash flow [Member] |
Quantitative Information About Level 3 Fair Value Measurements |
Input utilized two | 10%, lagged 2 years

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- Definition Input utilized one. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Input utilized two. + References No definition available. + Details
Name: | ccne_InputUtilizedTwo
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | instant

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

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant