Acquisitions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Apr. 13, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Loans held for sale	$ 6,278,000		$ 6,278,000			$ 2,510,000
Bank owned life insurance	67,943,000		67,943,000			62,176,000
Goodwill	151,423,000		151,423,000			$ 133,111,000
Business Combination, Acquired Receivables [Abstract]
Noninterest Expense	35,971,000	$ 26,680,000	64,192,000	$ 54,011,000
Net (loss) gain on asset disposals and other transactions	(405,000)	109,000	(331,000)	106,000
Salaries and employee benefit costs	18,025,000	15,049,000	34,015,000	30,545,000
Professional fees	3,022,000	1,529,000	4,740,000	3,139,000
Other non-interest expense	6,129,000	$ 1,998,000	8,281,000	$ 4,089,000
ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Business Combination, number of shares electing cash consideration					31,763,000
Total consideration	41,500,000		41,533,000
Shares, Outstanding					1,979,034
Common stock election					1,947,271,000
Cash purchase price per share					$ 20.00
Number of common shares of Peoples issued for each common share of acquired company					0.592
Price per Peoples common share, based on closing date					$ 35.48
Common share consideration					$ 40,898,000
Cash in lieu of fractional common shares of Peoples					2,000
Total cash and cash equivalents					5,332,000
Loans held for sale					2,539,000
Bank premises and equipment, net					2,965,000
Bank owned life insurance					4,803,000
Other intangible assets					2,639,000
Other assets					3,447,000
Total assets					279,234,000
Deposits					198,629,000
Short-term borrowings					54,824,000
Accrued expenses and other liabilities					2,558,000
Total liabilities					256,011,000
Net assets					23,223,000
Goodwill					18,312,000
Business Combination, Acquired Receivables [Abstract]
Noninterest Expense	6,100,000		6,200,000
Net (loss) gain on asset disposals and other transactions	205,000
Salaries and employee benefit costs			1,900,000
Professional fees	652,000		$ 712,000
Other non-interest expense	$ 3,400,000
Acquired Nonimpaired Loans [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					228,806,000
Business Combination, Acquired Receivables [Abstract]
Contractual cash flows					348,235,000
Certain Loans Acquired in Transfer, Nonaccretable Difference					61,960,000
Business Combination Acquired Receivables Expected Cash Flows					286,275,000
Business Combination Acquired Receivable Accretable Yield					57,469,000
Available-for-sale securities | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					18,155,000
Held-to-maturity securities | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					649,000
Investment in Federal Home Loan Bank Stock [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					1,596,000
Debt Securities [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					20,400,000
Loans [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					237,109,000
Acquired Purchased Credit Impaired Loans [Member] | ASB Financial Corp. [Member]
Business Combination, Acquired Receivables [Abstract]
Certain Loans Acquired in Transfer, Nonaccretable Difference					5,305,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition					18,562,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition					13,257,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield					2,415,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value					10,842,000
Acquired Loans | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value					239,648,000
Non-interest-bearing deposits [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Deposits					29,487,000
Interest-bearing Deposits [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Deposits					169,142,000
Cash [Member]
Business Acquisition [Line Items]
Cash consideration					$ 635,000