Acquisitions Acquisitions Purchase Price and Fair Value of Assets Acquired and Liabilities Assumed (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 30, 2014	Aug. 22, 2014	Oct. 24, 2014
Net Assets at Fair Value
Goodwill	$ 98,562,000	$ 70,520,000	$ 64,881,000
Midwest Bancshares, Inc.
Purchase Price
Common shares outstanding at merger announcement				192,500
Cash purchase price per share				$ 24.60
Number of common shares of Peoples issued for each common share of acquired company				1.33
Total purchase price	12,600,000
Net Assets at Fair Value
Cash and cash equivalents				3,562,000
Bank premises and equipment, net				1,446,000
Other intangible assets				976,000
Other assets				1,089,000
Total assets				88,987,000
Deposits				77,945,000
Borrowings				0
Accrued expenses and other liabilities				109,000
Total liabilities				78,054,000
Net assets				10,933,000
Goodwill				1,676,000
Midwest Bancshares, Inc. | Investment securities
Net Assets at Fair Value
Debt securities and loans				23,198,000
Midwest Bancshares, Inc. | Loans, including loans held for sale, net of deferred fees and costs
Net Assets at Fair Value
Debt securities and loans				58,716,000
Ohio Heritage Bancorp, Inc.
Purchase Price
Common shares outstanding at merger announcement					342,458
Cash purchase price per share					$ 23.46
Number of common shares of Peoples issued for each common share of acquired company					3.99
Total purchase price	37,700,000
Net Assets at Fair Value
Cash and cash equivalents					18,231,000
Bank premises and equipment, net					4,943,000
Other intangible assets					2,421,000
Other assets					9,330,000
Total assets					239,590,000
Deposits					174,881,000
Borrowings					42,440,000
Accrued expenses and other liabilities					2,646,000
Total liabilities					219,967,000
Net assets					19,623,000
Goodwill					18,047,000
Ohio Heritage Bancorp, Inc. | Investment securities
Net Assets at Fair Value
Debt securities and loans					28,865,000
Ohio Heritage Bancorp, Inc. | Loans, including loans held for sale, net of deferred fees and costs
Net Assets at Fair Value
Debt securities and loans					175,800,000
North Akron Savings Bank
Purchase Price
Common shares outstanding at merger announcement						2,630
Cash purchase price per share						$ 24.20
Number of common shares of Peoples issued for each common share of acquired company						253.06
Total purchase price	20,100,000
Net Assets at Fair Value
Cash and cash equivalents						11,028,000
Bank premises and equipment, net						1,815,000
Other intangible assets						1,389,000
Other assets						1,090,000
Total assets						144,444,000
Deposits						108,102,000
Borrowings						24,209,000
Accrued expenses and other liabilities						212,000
Total liabilities						132,523,000
Net assets						11,921,000
Goodwill						8,212,000
North Akron Savings Bank | Investment securities
Net Assets at Fair Value
Debt securities and loans						17,597,000
North Akron Savings Bank | Loans, including loans held for sale, net of deferred fees and costs
Net Assets at Fair Value
Debt securities and loans						111,525,000
Cash Portion of Purchase Price | Midwest Bancshares, Inc.
Purchase Price
Cash purchase price per share				$ 32.75
Cash consideration				6,304,000
Cash Portion of Purchase Price | Ohio Heritage Bancorp, Inc.
Purchase Price
Cash purchase price per share					$ 16.50
Cash consideration					5,650,000
Cash Portion of Purchase Price | North Akron Savings Bank
Purchase Price
Cash purchase price per share						$ 1,531.00
Cash consideration						4,027,000
Stock Portion of Purchase Price | Midwest Bancshares, Inc.
Purchase Price
Cash consideration				6,305,000
Stock Portion of Purchase Price | Ohio Heritage Bancorp, Inc.
Purchase Price
Cash consideration					32,020,000
Stock Portion of Purchase Price | North Akron Savings Bank
Purchase Price
Cash consideration						$ 16,106,000