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Deferred Compensation Plans - Summary of Changes in Deferred Compensation Plan Liability (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation Related Costs [Abstract]
Balance, beginning of year	$ 1,100us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent	$ 990us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent	$ 987us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent
Deferrals, dividends, and changes in fair value recorded as an expense	36us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense	191us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense	84us-gaap_DeferredCompensationArrangementWithIndividualAllocatedShareBasedCompensationExpense
Deferred compensation payments	(49)ccne_DeferredCompensationPayments	(81)ccne_DeferredCompensationPayments	(81)ccne_DeferredCompensationPayments
Balance, end of year	$ 1,087us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent	$ 1,100us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent	$ 990us-gaap_DeferredCompensationLiabilityCurrentAndNoncurrent

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- Definition

Deferred compensation payments.

+ References

No definition available.

+ Details

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

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- Details

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

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- Definition

Amount of expense recognized from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments), awarded to key employees or individuals. Excludes amount related to plans that cover generally all employees (for example, but not limited to, qualified pension plans).

+ References

No definition available.

+ Details

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

X

- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

+ References

No definition available.

+ Details

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