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Foreclosed Assets - Summary of Foreclosed Assets Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Real Estate Net Of Valuation Allowance [Roll Forward] |  |  |
Balance, beginning of year | $ 418 | $ 710 | $ 1,015
Additions | 2,066 | 228 | 630
Sales (at carrying value) | (851) | (520) | (935)
Balance, end of year | $ 1,633 | $ 418 | $ 710

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- Definition Foreclosed real estate assets sold at carrying value. + References No definition available. + Details
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Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Real estate acquired additions through foreclosure. + References No definition available. + Details
Name: | ccne_RealEstateAcquiredAdditionsThroughForeclosure
Namespace Prefix: | ccne_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Real Estate Net Of Valuation Allowance [Roll Forward] + References No definition available. + Details
Name: | ccne_RealEstateNetOfValuationAllowanceRollForward
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5162-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4437-111522 + Details
Name: | us-gaap_ForeclosedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant