Additional provision for loan losses.

No definition available.

Name:	ccne_AdditionalProvisionForLoanLosses
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Commercial industrial and agricultural loan amount as maximum percentage of accounts receivable.

+ References

No definition available.

+ Details

Name:	ccne_CommercialIndustrialAndAgriculturalLoanAmountAsMaximumPercentageOfAccountsReceivable
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Commercial industrial and agricultural loan amount as maximum percentage of business equipment.

+ References

No definition available.

+ Details

Name:	ccne_CommercialIndustrialAndAgriculturalLoanAmountAsMaximumPercentageOfBusinessEquipment
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Commercial industrial and agricultural loan amount as maximum percentage of business inventory.

+ References

No definition available.

+ Details

Name:	ccne_CommercialIndustrialAndAgriculturalLoanAmountAsMaximumPercentageOfBusinessInventory
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Commercial mortgage loan amount as maximum percentage of appraised real estate value.

+ References

No definition available.

+ Details

Name:	ccne_CommercialMortgageLoanAmountAsMaximumPercentageOfAppraisedRealEstateValue
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Loans segment reclassification adjustments.

+ References

No definition available.

+ Details

Name:	ccne_LoansSegmentReclassificationAdjustments
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Minimum period to be considered for loan to have defaulted.

+ References

No definition available.

+ Details

Name:	ccne_MinimumPeriodToBeConsideredForLoanToHaveDefaulted
Namespace Prefix:	ccne_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum risk rating category of commercial loans.

+ References

No definition available.

+ Details

Name:	ccne_MinimumRiskRatingCategoryOfCommercialLoans
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Modification involving extension of maturity date having loan period.

+ References

No definition available.

+ Details

Name:	ccne_ModificationInvolvingExtensionOfMaturityDateHavingLoanPeriod
Namespace Prefix:	ccne_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Modification involving reduction of stated interest rate having loan period.

+ References

No definition available.

+ Details

Name:	ccne_ModificationInvolvingReductionOfStatedInterestRateHavingLoanPeriod
Namespace Prefix:	ccne_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Outstanding balance of annual loans.

+ References

No definition available.

+ Details

Name:	ccne_OutStandingBalanceOfAnnualLoans
Namespace Prefix:	ccne_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Outstanding balance of semi annual loans.

+ References

No definition available.

+ Details

Name:	ccne_OutstandingBalanceOfSemiAnnualLoans
Namespace Prefix:	ccne_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of commercial industrial and agricultural loans in loan portfolio.

+ References

No definition available.

+ Details

Name:	ccne_PercentageOfCommercialIndustrialAndAgriculturalLoansInLoanPortfolio
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of commercial mortgage loans in loan portfolio.

+ References

No definition available.

+ Details

Name:	ccne_PercentageOfCommercialMortgageLoansInLoanPortfolio
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of consumer loans and credit card products in loan portfolio.

+ References

No definition available.

+ Details

Name:	ccne_PercentageOfConsumerLoansAndCreditCardProductsInLoanPortfolio
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of residential real estate loans in loan portfolio.

+ References

No definition available.

+ Details

Name:	ccne_PercentageOfResidentialRealEstateLoansInLoanPortfolio
Namespace Prefix:	ccne_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Troubled debt restructuring loan principal balance forgiven.

+ References

No definition available.

+ Details

Name:	ccne_TroubledDebtRestructuringLoanPrincipalBalanceForgiven
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 34

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

+ Details

Name:	us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Loans - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended			6 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended
Loans - Additional Information (Detail) (USD $)	Jun. 30, 2014 Loans	Dec. 31, 2013 Loans	Jun. 30, 2014 Trouble Debt Restructuring [Member] Loans	Jun. 30, 2013 Trouble Debt Restructuring [Member] Loans	Jun. 30, 2014 Trouble Debt Restructuring [Member] Loans	Jun. 30, 2014 Maximum [Member]	Dec. 31, 2013 Maximum [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2013 Commercial Mortgage Loan One [Member]	Mar. 31, 2013 Commercial Mortgage Loan One [Member]	Jun. 30, 2013 Commercial Mortgage Loan One [Member]	Dec. 31, 2013 Commercial Mortgage Loan One [Member]	Dec. 31, 2012 Commercial Mortgage Loan One [Member]	Mar. 31, 2014 Commercial, Industrial, and Agricultural [Member]	Jun. 30, 2014 Commercial, Industrial, and Agricultural [Member]	Mar. 31, 2014 Commercial Mortgages [Member]	Mar. 31, 2014 Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net unamortized loan costs and fees	$ 830,000	$ 911,000
Percentage of comprised loan, commercial, industrial and agricultural loans	33.00%	33.00%
Percentage of comprised loan, commercial mortgage loans	27.00%	27.00%
Risk rating to commercial loans	250,000,000
Percentage of loan-to-value to business equipment	80.00%
Percentage of loan-to-value to accounts receivable	75.00%
Percentage of loan-to-value to business inventory	60.00%
Percentage of loan-to-value to real estate	85.00%
Percentage of residential real estate loan in portfolio	37.00%	36.00%
Maximum percentage of consumer loan and credit card in portfolio						10.00%	10.00%
Loan portfolio segment reclassification														66,000,000	70,000,000	54,000,000	12,000,000
Number of Loans	12	12	0	0	1
Reduction in stated interest rate modification having loan range period						15 years		4 years
Extension of maturity date modification having loan range period						18 years		4 years
Minimum period to be considered for loan to have defaulted	90 days
Principal balances forgiven in connection with loan restructurings	0	0
Troubled debt restructuring charged off										595,000
Commercial mortgage loan balance amount												1,086,000	1,660,000
Additional provision for loan losses									$ 0		$ 135,000	$ 615,000
Outstanding balance of semi annual loans	Greater than $1 million
Outstanding balance of annual loans	Less than $1 million