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Recent Accounting Pronouncements (Details)	12 Months Ended
	Dec. 31, 2019
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss, percentage increase	20.00%
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss, percentage increase	30.00%

X

- Definition

Allowance for Credit Loss, Percentage Increase

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: