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Securities - Additional Information (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) security	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) security
Debt and Equity Securities, FV-NI [Line Items]
Number of securities holdings | security	0		0
Shareholders' equity percentage (greater than)	10.00%		10.00%
Tax provision related to net realized gains	$ 460	$ 31
Collateral Pledged
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, trading, restricted	$ 442,613		$ 405,200

X

- Definition

Number of securities holdings.

+ References

No definition available.

+ Details

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X

- Definition

Shareholders equity percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccne_
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X

- Definition

Tax provision related to net realized gains.

+ References

No definition available.

+ Details

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Namespace Prefix:	ccne_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

+ Details

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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

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X

- Details

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