Fair Value of Financial Instruments (Assets Measured at Fair Value Recurring) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Recurring Basis
Available-for-sale securities	$ 1,297,090	$ 753,013
U.S. government sponsored agencies
Recurring Basis
Available-for-sale securities	78,481	5,363
States and political subdivisions
Recurring Basis
Available-for-sale securities	252,919	114,919
Residential mortgage-backed securities
Recurring Basis
Available-for-sale securities	898,459	623,218
Commercial mortgage-backed securities
Recurring Basis
Available-for-sale securities	62,552	4,783
Bank-issued trust preferred securities
Recurring Basis
Available-for-sale securities	4,679	4,730
Equity investment securities (a)
Recurring Basis
Other investment securities (b)	390	299
Recurring Basis [Member] \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Interest Rate Derivative Assets, at Fair Value	0	0
Interest Rate Derivative Liabilities, at Fair Value	0	0
Recurring Basis [Member] \| Level 2
Recurring Basis
Available-for-sale securities	1,297,090	753,013
Interest Rate Derivative Assets, at Fair Value	15,653	27,332
Interest Rate Derivative Liabilities, at Fair Value	22,904	39,395
Recurring Basis [Member] \| U.S. government sponsored agencies \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| U.S. government sponsored agencies \| Level 2
Recurring Basis
Available-for-sale securities	78,481	5,363
Recurring Basis [Member] \| States and political subdivisions \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| States and political subdivisions \| Level 2
Recurring Basis
Available-for-sale securities	252,919	114,919
Recurring Basis [Member] \| Residential mortgage-backed securities \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Residential mortgage-backed securities \| Level 2
Recurring Basis
Available-for-sale securities	898,459	623,218
Recurring Basis [Member] \| Commercial mortgage-backed securities \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Commercial mortgage-backed securities \| Level 2
Recurring Basis
Available-for-sale securities	62,552	4,783
Recurring Basis [Member] \| Bank-issued trust preferred securities \| Level 1
Recurring Basis
Available-for-sale securities	0	0
Recurring Basis [Member] \| Bank-issued trust preferred securities \| Level 2
Recurring Basis
Available-for-sale securities	4,679	4,730
Recurring Basis [Member] \| Equity investment securities (a) \| Level 1
Recurring Basis
Other investment securities (b)	145	107
Recurring Basis [Member] \| Equity investment securities (a) \| Level 2
Recurring Basis
Other investment securities (b)	$ 245	$ 192

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

No definition available.

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

- Definition

Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

+ References

No definition available.

+ Details

Name:	us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities.

+ References

No definition available.

+ Details

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

- Definition

Amount of investments classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(f,g))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=pebo_BankIssuedTrustPreferredSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: