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Foreclosed Assets - Summary of Expenses Related to Foreclosed Real Estate (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Banking And Thrift [Abstract] |  |  |
Net loss (gain) on sale | $ (252) | $ (158) | $ (101)
Operating expenses, net of rental income | 81 | 176 | 24
Total | $ (171) | $ 18 | $ (77)

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- Definition Foreclosed real estate gain loss on sale. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Foreclosed real estate gain loss on sale net. + References No definition available. + Details
Name: | ccne_ForeclosedRealEstateGainLossOnSaleNet
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Foreclosed real estate operating expense net. + References No definition available. + Details
Name: | ccne_ForeclosedRealEstateOperatingExpenseNet
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration