Loans Troubled Debt Restructurings (Details)	12 Months Ended
Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
Impact on allowance for loan losses for loans modified as a TDR that subsequently defaulted	Troubled Debt Restructuring ("TDR"): The restructuring of a loan is considered a TDR if both (1) the borrower is experiencing financial difficulties and (2) the creditor has granted a concession. Loans acquired that are restructured after acquisition are not considered TDRs if the loans evidenced credit deterioration as of the acquisition date and are accounted for in pools of purchased credit impaired loans. In assessing whether or not a borrower is experiencing financial difficulties, Peoples considers information currently available regarding the financial condition of the borrower. This information includes, but is not limited to, whether (1) the borrower is currently in payment default on any of the borrower's debt; (2) a payment default is probable in the foreseeable future without the modification; (3) the borrower has declared or is in the process of declaring bankruptcy; and (4) the borrower's projected cash flow is insufficient to satisfy contractual payments due under the original terms of the loan without a modification. Peoples considers all aspects of the modification to loan terms to determine whether or not a concession has been granted to the borrower. Key factors considered by Peoples include the borrower's ability to access funds at a market rate for loans with similar risk characteristics, the significance of the modification relative to the unpaid principal loan balance or collateral value underlying the loan, and the significance of a delay in the timing of payments relative to the original contractual terms of the loan. The most common concessions granted by Peoples generally include one or more modifications to the terms of the loan, such as (1) a reduction in the interest rate for the remaining life of the loan, (2) an extension of the maturity date at an interest rate lower than the current market rate for a new loan with similar risk, (3) a temporary period of interest-only payments, and (4) a reduction in the contractual payment amount for either a short period or the remaining term of the loan. All TDRs are considered impaired loans and are evaluated individually to determine if a write-down is required and if they should be on accrual or nonaccrual status.
Additional commitments to lend funds to debtors whose terms have been modified in a TDR	$ 0
Financial Asset Originated [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	29	50
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 926,000	$ 2,801,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	929,000	2,801,000
Financing Receivable, Troubled Debt Restructuring	$ 878,000	$ 2,714,000
Number of contracts modified as a TDR that subsequently defaulted \| contract		2
Recorded investment in loans modified as a TDR that subsequently defaulted		$ 88,000
Financial Asset Originated [Member] \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	2	1
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 38,000	$ 714,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	38,000	714,000
Financing Receivable, Troubled Debt Restructuring	$ 32,000	$ 714,000
Financial Asset Originated [Member] \| Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	3	9
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 437,000	$ 904,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	440,000	904,000
Financing Receivable, Troubled Debt Restructuring	$ 431,000	$ 899,000
Number of contracts modified as a TDR that subsequently defaulted \| contract		1
Recorded investment in loans modified as a TDR that subsequently defaulted		$ 56,000
Financial Asset Originated [Member] \| Home equity lines of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	4	8
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 139,000	$ 666,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	139,000	666,000
Financing Receivable, Troubled Debt Restructuring	$ 136,000	$ 660,000
Number of contracts modified as a TDR that subsequently defaulted \| contract		1
Recorded investment in loans modified as a TDR that subsequently defaulted		$ 32,000
Financial Asset Originated [Member] \| Consumer, indirect
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	17	27
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 260,000	$ 485,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	260,000	485,000
Financing Receivable, Troubled Debt Restructuring	$ 234,000	$ 412,000
Financial Asset Originated [Member] \| Consumer, direct
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	3	5
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 52,000	$ 32,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	52,000	32,000
Financing Receivable, Troubled Debt Restructuring	$ 45,000	$ 29,000
Financial Asset Originated [Member] \| Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	20	32
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 312,000	$ 517,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	312,000	517,000
Financing Receivable, Troubled Debt Restructuring	$ 279,000	$ 441,000
Acquired Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	64	22
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 4,023,000	$ 1,504,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	3,999,000	1,504,000
Financing Receivable, Troubled Debt Restructuring	$ 3,785,000	$ 1,464,000
Number of contracts modified as a TDR that subsequently defaulted \| contract		1
Recorded investment in loans modified as a TDR that subsequently defaulted		$ 10,000
Acquired Loans \| Commercial real estate, other
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	3
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 101,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	76,000
Financing Receivable, Troubled Debt Restructuring	$ 76,000
Acquired Loans \| Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract		1
Financing Receivable, Troubled Debt Restructuring, Premodification		$ 50,000
Financing Receivable, Troubled Debt Restructuring, Postmodification		50,000
Financing Receivable, Troubled Debt Restructuring		$ 45,000
Acquired Loans \| Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	5
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 1,557,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	1,557,000
Financing Receivable, Troubled Debt Restructuring	$ 1,464,000
Acquired Loans \| Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	38	15
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 2,069,000	$ 1,258,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	2,069,000	1,258,000
Financing Receivable, Troubled Debt Restructuring	$ 1,967,000	$ 1,226,000
Acquired Loans \| Home equity lines of credit
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	8	6
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 172,000	$ 196,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	173,000	196,000
Financing Receivable, Troubled Debt Restructuring	$ 164,000	$ 193,000
Number of contracts modified as a TDR that subsequently defaulted \| contract		1
Recorded investment in loans modified as a TDR that subsequently defaulted		$ 10,000
Acquired Loans \| Consumer, direct
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing Receivable, Modifications, Number of Contracts \| contract	10
Financing Receivable, Troubled Debt Restructuring, Premodification	$ 124,000
Financing Receivable, Troubled Debt Restructuring, Postmodification	124,000
Financing Receivable, Troubled Debt Restructuring	$ 114,000

Loans Troubled Debt Restructurings (Details)

12 Months Ended

Dec. 31, 2019

USD ($)

contract

Dec. 31, 2018

USD ($)

contract

Financing Receivable, Troubled Debt Restructuring [Line Items]

Impact on allowance for loan losses for loans modified as a TDR that subsequently defaulted

Troubled Debt Restructuring ("TDR"): The restructuring of a loan is considered a TDR if both (1) the borrower is experiencing financial difficulties and (2) the creditor has granted a concession. Loans acquired that are restructured after acquisition are not considered TDRs if the loans evidenced credit deterioration as of the acquisition date and are accounted for in pools of purchased credit impaired loans.

In assessing whether or not a borrower is experiencing financial difficulties, Peoples considers information currently available regarding the financial condition of the borrower. This information includes, but is not limited to, whether (1) the borrower is currently in payment default on any of the borrower's debt; (2) a payment default is probable in the foreseeable future without the modification; (3) the borrower has declared or is in the process of declaring bankruptcy; and (4) the borrower's projected cash flow is insufficient to satisfy contractual payments due under the original terms of the loan without a modification.

Peoples considers all aspects of the modification to loan terms to determine whether or not a concession has been granted to the borrower. Key factors considered by Peoples include the borrower's ability to access funds at a market rate for loans with similar risk characteristics, the significance of the modification relative to the unpaid principal loan balance or collateral value underlying the loan, and the significance of a delay in the timing of payments relative to the original contractual terms of the loan. The most common concessions granted by Peoples generally include one or more modifications to the terms of the loan, such as (1) a reduction in the interest rate for the remaining life of the loan, (2) an extension of the maturity date at an interest rate lower than the current market rate for a new loan with similar risk, (3) a temporary period of interest-only payments, and (4) a reduction in the contractual payment amount for either a short period or the remaining term of the loan. All TDRs are considered impaired loans and are evaluated individually to determine if a write-down is required and if they should be on accrual or nonaccrual status.