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Derivative Instruments - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 03, 2011 | Mar. 31, 2015 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Term of interest rate swap agreement executed | 5 years |  |
Interest rate swap inception date | May 03, 2011 |  |
Value of subordinated note hedged | $ 10,000,000 us-gaap_DerivativeCostOfHedge |  |
Interest rate swap effective date | Sep. 15, 2013 |  |
Interest rate | The interest rate swap involves the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2013 to September 15, 2018 without exchange of the underlying notional amount. |  |
Derivatives designated as fair value hedges |  | 0 us-gaap_FairValueHedgesAtFairValueNet | 0 us-gaap_FairValueHedgesAtFairValueNet
Accumulated other comprehensive loss estimated |  | 379,000 ccne_AccumulatedOtherComprehensiveIncomeLossEstimatedReclassificationAdjustmentOnDerivativesIncludedInNetIncomeInNextTwelveMonths |
Collateral amount for counterparty interest rate swap |  | $ 1,400,000 us-gaap_DerivativeCollateralRightToReclaimCash | $ 1,400,000 us-gaap_DerivativeCollateralRightToReclaimCash
LIBOR Plus 155 Basis Points [Member] |  |  |
Derivative [Line Items] |  |  |
Variable rate on the subordinated debt on effective date in case of interest rate swap |  | LIBOR plus 155 basis points |
Variable interest rate on subordinate debt |  | 1.79%us-gaap_SubordinatedBorrowingInterestRate / us-gaap_DerivativeInstrumentRiskAxis = ccne_LiborPlusOneHundredAndFiftyFiveBasisPointsMember |
4.02% Fixed Rate Plus 155 Basis Points [Member] |  |  |
Derivative [Line Items] |  |  |
Variable rate on the subordinated debt on effective date in case of interest rate swap |  | 4.02% fixed rate plus 155 basis points |
Interest rate being paid by the corporation |  | 5.57%us-gaap_DerivativeAverageVariableInterestRate / us-gaap_DerivativeInstrumentRiskAxis = ccne_FourPointZeroTwoPercentageFixedRatePlusOneHundredAndFiftyFiveBasisPointsMember |
Interest Rate Swaps [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative basis spread on variable rate |  | 1.55%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |
Derivative fixed interest rate rate basis |  | 4.02%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |

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- Definition Accumulated other comprehensive income loss estimated reclassification adjustment on derivatives included in net income in next twelve months. + References No definition available. + Details
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- Definition Interest rate swap agreement effective date. + References No definition available. + Details
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- Definition Term of interest rate swap agreement executed. + References No definition available. + Details
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- Definition Average variable interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41678-113959 + Details
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- Definition The premium (cost) of a hedge, expensed during the period. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Details
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- Definition General discussion of the entity's interest rate derivative activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41620-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579240-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41641-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35706170&loc=d3e41638-113959 + Details
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- Definition Net fair value of all derivative instruments designated as fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Stated interest rate of the subordinated debt. + References No definition available. + Details
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- Details
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- Details
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- Details
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