Investment Securities (Pledged Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Investments [Abstract]
Carrying value of available-for-sale securities pledged to secure public and trust department deposits and repurchase agreements	$ 340.8	$ 359.1
Carrying value of held-to-maturity securities pledged to secure public and trust department deposits and repurchase agreements	30.2	3.0
Carrying value of available-for-sale securities pledged to secure additional borrowing capacity at FHLB and FRB	$ 53.6	$ 65.2

Pledged Financial Instruments, Not Separately Reported, Available-for-sale Securities for Federal Home Loan Bank and Federal Reserve Bank

No definition available.

Name:	pebo_PledgedFinancialInstrumentsNotSeparatelyReportedAvailableForSaleSecuritiesForFederalHomeLoanBankAndFederalReserveBank
Namespace Prefix:	pebo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant