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Borrowings - Schedule of Remaining Borrowing Capacity with FHLB (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 101,695us-gaap_AdvancesFromFederalHomeLoanBanks	$ 65,000us-gaap_AdvancesFromFederalHomeLoanBanks
Interest Rate 0.27% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	35,980us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateOneMember	0us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateOneMember
Maturity date	May 01, 2015
Interest Rate 2.09% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	20,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateTwoMember	20,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateTwoMember
Maturity date	Sep. 17, 2015
Interest Rate 4.60% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	10,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateThreeMember	10,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateThreeMember
Maturity date	Jun. 01, 2017
Interest Rate 4.02% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	5,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourMember	5,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourMember
Maturity date	Aug. 07, 2017
Interest Rate 4.10% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	5,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateFiveMember	5,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateFiveMember
Maturity date	Aug. 07, 2017
Interest Rate 4.47% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	10,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateSixMember	10,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateSixMember
Maturity date	Aug. 07, 2017
Interest Rate 3.97% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	10,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateSevenMember	10,000us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateSevenMember
Maturity date	Oct. 10, 2017
Interest Rate 4.72% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	700us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateEightMember	700us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateEightMember
Maturity date	Jul. 03, 2023
Interest Rate 4.31% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	2,167us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateNineMember	2,280us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateNineMember
Maturity date	Sep. 05, 2023
Interest Rate 3.05% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	924us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateTenMember	0us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateTenMember
Maturity date	Mar. 11, 2024
Interest Rate 5.24%[Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	513us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateElevenMember	535us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateElevenMember
Maturity date	Jun. 11, 2024
Interest Rate 3.35% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	282us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateTwelveMember	302us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateTwelveMember
Maturity date	May 04, 2026
Interest Rate 4.00% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	292us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateThirteenMember	311us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateThirteenMember
Maturity date	Oct. 14, 2026
Interest Rate 3.23% [Member]
Borrowings Under Repurchase Agreements [Line items]
Borrowings	$ 837us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourteenMember	$ 872us-gaap_AdvancesFromFederalHomeLoanBanks / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourteenMember
Maturity date	Feb. 11, 2033

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- Definition

Federal home loan bank advances general debt obligations disclosures maturity date.

+ References

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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