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Fair Value (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012
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Corporate notes and bonds [Member] |
Quantitative information about Level 3 fair value measurements |
Fair Value | $ 2,071
Pooled trust preferred [Member] |
Quantitative information about Level 3 fair value measurements |
Fair Value | $ 360
Constant prepayment rate [Member] | Corporate notes and bonds [Member] |
Quantitative information about Level 3 fair value measurements |
Input Utilized One | 0.00%
Probability of default [Member] | Corporate notes and bonds [Member] |
Quantitative information about Level 3 fair value measurements |
Input Utilized One | 0.00%
Discount rate [Member] | Corporate notes and bonds [Member] |
Quantitative information about Level 3 fair value measurements |
Input Utilized One | 9.20%
Discount rate [Member] | Pooled trust preferred [Member] |
Quantitative information about Level 3 fair value measurements |
Input Utilized Two | 10%, lagged 2 years
Collateral default rate [Member] | Pooled trust preferred [Member] |
Quantitative information about Level 3 fair value measurements |
Input Utilized One | 19.00%
Input Utilized Two | 2% annually for 2 years; 0.36% thereafter
Recovery probability [Member] | Pooled trust preferred [Member] |
Quantitative information about Level 3 fair value measurements |
Input Utilized Two | 5% for next 5 years

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

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- Definition Input Utilized + 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
Name: | ccne_QuantitativeInformationAboutLevelThreeFairValueMeasurementsAbstract
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration