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DEPOSITS - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Deposits [Abstract]
Certificates of deposit of $250 thousand or more	$ 103.2	$ 100.2
Brokered deposits	182.9	208.3
Reciprocal deposits	$ 778.2	$ 739.3

X

- Definition

Interest Bearing Domestic Deposit, Reciprocal

+ References

No definition available.

+ Details

Name:	ccne_InterestBearingDomesticDepositReciprocal
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Time Deposits 250000 Or More

+ References

No definition available.

+ Details

Name:	ccne_TimeDeposits250000OrMore
Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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