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Secondary Market Mortgage Activities - Summary of Activity for Capital Mortgage Servicing Rights (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage Banking [Abstract]      
Balance, beginning of year $ 904ccne_CapitalizedMortgageServicingRights $ 714ccne_CapitalizedMortgageServicingRights $ 906ccne_CapitalizedMortgageServicingRights
Additions 240us-gaap_PaymentsToAcquireMortgageServicingRightsMSR 350us-gaap_PaymentsToAcquireMortgageServicingRightsMSR 85us-gaap_PaymentsToAcquireMortgageServicingRightsMSR
Servicing rights acquired 0us-gaap_ServicingAssetAtAmortizedValueAdditions 83us-gaap_ServicingAssetAtAmortizedValueAdditions 0us-gaap_ServicingAssetAtAmortizedValueAdditions
Amortization (288)us-gaap_AmortizationOfMortgageServicingRightsMSRs (243)us-gaap_AmortizationOfMortgageServicingRightsMSRs (277)us-gaap_AmortizationOfMortgageServicingRightsMSRs
Balance, end of year $ 856ccne_CapitalizedMortgageServicingRightsEndingBalance $ 904ccne_CapitalizedMortgageServicingRightsEndingBalance $ 714ccne_CapitalizedMortgageServicingRightsEndingBalance