Acquisitions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Apr. 13, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Loans held for sale	$ 4,776,000		$ 4,776,000				$ 2,510,000
Bank owned life insurance	68,439,000		68,439,000				62,176,000
Goodwill	151,673,000		151,673,000				$ 133,111,000
Business Combination, Acquired Receivables [Abstract]
Noninterest Expense	30,829,000	$ 26,558,000	95,021,000	$ 80,569,000
Net gain (loss) on asset disposals and other transactions	12,000	(25,000)	(319,000)	81,000
Salaries and employee benefit costs	17,908,000	15,141,000	51,923,000	45,686,000
Professional fees	1,395,000	1,393,000	6,135,000	4,532,000
Data processing and software expense	1,408,000	1,092,000	4,089,000	3,330,000
Other non-interest expense	2,713,000	$ 1,973,000	11,113,000	$ 6,211,000
FIRST PRESTONSBURG BANCSHARES INC. [Member]
Business Acquisition [Line Items]
Total consideration	45,400,000
Goodwill, Purchase Accounting Adjustments	250,000
ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Business Combination, number of shares electing cash consideration						31,763,000
Total consideration	41,500,000		41,535,000
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 of accumulated depreciation						3,320,000
Bank owned life insurance						4,803,000
Other intangible assets						2,639,000
Other assets						3,481,000
Total assets						279,142,000
Deposits						198,629,000
Short-term borrowings						54,824,000
Accrued expenses and other liabilities						2,716,000
Total liabilities						256,169,000
Net assets						22,973,000
Goodwill					$ 18,300,000	18,562,000
Business Combination, Acquired Receivables [Abstract]
Noninterest Expense	675,000		6,900,000
Net gain (loss) on asset disposals and other transactions	203,000
Salaries and employee benefit costs	466,000		2,400,000
Professional fees	31,000		742,000
Data processing and software expense	0		59,000
Marketing Expense	16,000		107,000
Other non-interest expense	162,000		3,600,000
Financial Asset Acquired and No Credit Deterioration | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value						228,091,000
Business Combination, Acquired Receivables [Abstract]
Contractual cash flows						342,087,000
Certain Loans Acquired in Transfer, Nonaccretable Difference						59,967,000
Business Combination Acquired Receivables Expected Cash Flows						282,120,000
Business Combination Acquired Receivable Accretable Yield						54,029,000
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]
Goodwill, Purchase Accounting Adjustments	$ 481,000
Acquired Receivable, Fair Value						236,628,000
Financial Asset Acquired with Credit Deterioration | ASB Financial Corp. [Member]
Business Combination, Acquired Receivables [Abstract]
Certain Loans Acquired in Transfer, Nonaccretable Difference						5,908,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition						19,031,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition						13,123,000
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield						2,047,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value						11,076,000
Acquired Loans | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value						239,167,000
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]
Total consideration			$ 11,275,000
Cash consideration						$ 635,000
FIRST PRESTONSBURG BANCSHARES INC. [Member]
Business Acquisition [Line Items]
Number of common shares of Peoples issued for each common share of acquired company	12.512		12.512
Deposits	$ 244,000,000		$ 244,000,000
FIRST PRESTONSBURG BANCSHARES INC. [Member] | Loans [Member]
Business Acquisition [Line Items]
Acquired Receivable, Fair Value	139,000,000		139,000,000
Total assets	310,000,000		$ 310,000,000
Property, Plant and Equipment [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Goodwill, Purchase Accounting Adjustments	355,000
Other Assets [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Goodwill, Purchase Accounting Adjustments	34,000
Other Liabilities [Member] | ASB Financial Corp. [Member]
Business Acquisition [Line Items]
Goodwill, Purchase Accounting Adjustments	$ 158,000