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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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Banking and Thrift [Abstract] |  |  |
Net loss (gain) on sale | $ (71)ccne_ForeclosedRealEstateGainLossOnSale | $ (252)ccne_ForeclosedRealEstateGainLossOnSale | $ (158)ccne_ForeclosedRealEstateGainLossOnSale
Operating expenses, net of rental income | 254 ccne_ForeclosedRealEstateOperatingExpenseNet | 81 ccne_ForeclosedRealEstateOperatingExpenseNet | 176 ccne_ForeclosedRealEstateOperatingExpenseNet
Total | $ 183 ccne_ForeclosedRealEstateGainLossOnSaleNet | $ (171)ccne_ForeclosedRealEstateGainLossOnSaleNet | $ 18 ccne_ForeclosedRealEstateGainLossOnSaleNet

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