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Foreclosed Assets - Summary of Expenses Related to Foreclosed Real Estate (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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 254ccne_ForeclosedRealEstateOperatingExpenseNet 81ccne_ForeclosedRealEstateOperatingExpenseNet 176ccne_ForeclosedRealEstateOperatingExpenseNet
Total $ 183ccne_ForeclosedRealEstateGainLossOnSaleNet $ (171)ccne_ForeclosedRealEstateGainLossOnSaleNet $ 18ccne_ForeclosedRealEstateGainLossOnSaleNet