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v2.4.1.9

Borrowings - Schedule of Remaining Borrowing Capacity with FHLB (Parenthetical) (Detail) | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2009 | Feb. 29, 2008 | Aug. 31, 2008 | Aug. 10, 2010 | Oct. 31, 2009
Interest Rate 0.27% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 0.27%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateOneMember |  |  |  |  |  |
Interest Rate 2.09% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 2.09%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateTwoMember |  |  |  |  |  |
Interest Rate 4.60% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.60%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateThreeMember | 4.60%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateThreeMember | 4.60%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateThreeMember |  |  |  |
FHLB advances, floating rate description | 3 month LIBOR + 0.16% |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.16%ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateBasisSpread / us-gaap_DebtInstrumentAxis = ccne_InterestRateThreeMember |  |  |  |  |  |
Interest Rate 4.02% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.02%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourMember | 4.02%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourMember |  | 4.02%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourMember |  |  |
FHLB advances, floating rate description | 3 month LIBOR + 0.11% |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.11%ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateBasisSpread / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourMember |  |  |  |  |  |
Interest Rate 4.10% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.10%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFiveMember | 4.10%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFiveMember |  |  | 4.10%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFiveMember |  |
FHLB advances, floating rate description | 3 month LIBOR + 0.11%. |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.11%ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateBasisSpread / us-gaap_DebtInstrumentAxis = ccne_InterestRateFiveMember |  |  |  |  |  |
Interest Rate 4.47% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.47%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateSixMember | 4.47%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateSixMember |  |  |  | 4.47%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateSixMember |
FHLB advances, floating rate description | 3 month LIBOR + 0.11%. |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.11%ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateBasisSpread / us-gaap_DebtInstrumentAxis = ccne_InterestRateSixMember |  |  |  |  |  |
Interest Rate 3.97% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 3.97%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateSevenMember | 3.97%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateSevenMember |  |  |  |  | 3.97%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateSevenMember
FHLB advances, floating rate description | 3 month LIBOR + 0.10%. |  |  |  |  |  |
FHLB advances, basis spread on floating rate | 0.10%ccne_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateBasisSpread / us-gaap_DebtInstrumentAxis = ccne_InterestRateSevenMember |  |  |  |  |  |
Interest Rate 4.72% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.72%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateEightMember |  |  |  |  |  |
Interest Rate 4.31% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.31%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateNineMember |  |  |  |  |  |
Interest Rate 3.05% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 3.05%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateTenMember |  |  |  |  |  |
Interest Rate 5.24%[Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 5.24%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateElevenMember |  |  |  |  |  |
Interest Rate 3.35% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 3.35%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateTwelveMember |  |  |  |  |  |
Interest Rate 4.00% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 4.00%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateThirteenMember |  |  |  |  |  |
Interest Rate 3.23% [Member] |  |  |  |  |  |  |
Borrowings Under Repurchase Agreements [Line items] |  |  |  |  |  |  |
Fixed rate on borrowings | 3.23%ccne_FederalHomeLoanBankAdvancesOpenRepoInterestRatePercentage / us-gaap_DebtInstrumentAxis = ccne_InterestRateFourteenMember |  |  |  |  |  |

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