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Fair Value - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, recorded investment	$ 25,107us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance		$ 24,657us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Impaired loans allowance	4,001us-gaap_ImpairedFinancingReceivableRelatedAllowance		3,415us-gaap_ImpairedFinancingReceivableRelatedAllowance
Collateral Dependent Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, recorded investment	7,049us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember	7,423us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember
Impaired loans allowance	2,056us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember	2,250us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember
Impaired loans, additional provisions	$ 3ccne_ImpairedFinancingReceivableAdditionalProvisions / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember	$ 350ccne_ImpairedFinancingReceivableAdditionalProvisions / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = ccne_CollateralDependentLoansMember

X

- Definition

Impaired financing receivable additional provisions.

+ References

No definition available.

+ Details

Name:	ccne_ImpairedFinancingReceivableAdditionalProvisions
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524

+ Details

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

X

- Details

Name:	us-gaap_EligibleItemOrGroupForFairValueOptionAxis=ccne_CollateralDependentLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: