XML 42 R31.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value - Quantitative Information About Level 3 Fair Value Measurements (Detail) - Pooled Trust Preferred [Member] $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Fair value | $ 2,049
Collateral Default Rate [Member] | Discounted Cash Flow [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Input utilized two | 0.5% in 2016 and thereafter
Yield (Weighted Average) [Member] | Discounted Cash Flow [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Input utilized one | 10.00%
Prepayment Speed [Member] | Discounted Cash Flow [Member] |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |
Input utilized two | 2.0% constant prepayment rate in 2016 and thereafter

X
- Definition Input utilized one. + References No definition available. + Details
Name: | ccne_InputUtilizedOne
Namespace Prefix: | ccne_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Input utilized two. + References No definition available. + Details
Name: | ccne_InputUtilizedTwo
Namespace Prefix: | ccne_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=ccne_PooledTrustPreferredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=ccne_CollateralDefaultRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=ccne_DiscountedCashFlowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=ccne_YieldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueConcentrationOfRiskDisclosureItemsAxis=ccne_PrepaymentSpeedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |