Summary of Significant Accounting Policies (Policies)	3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]
New Accounting Pronouncements	New Accounting Pronouncements: From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board ("FASB") or other standard setting bodies that are adopted by Peoples as of the required effective dates. The following accounting pronouncements should be read in conjunction with Note 1 Summary of Significant Accounting Policies of the Notes to the Consolidated Financial Statements included in Peoples’ 2018 Form 10-K. Accounting Standards Update ("ASU") 2017-04 - Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendments in this ASU simplify how an entity is required to test goodwill for impairment by eliminating the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2019 (effective January 1, 2020 for Peoples). Peoples early adopted this new accounting guidance as of January 1, 2019, and it will be incorporated in the October 1, 2019 annual goodwill and intangible assets impairment analysis, but it is not expected to have a material impact on Peoples' consolidated financial statements. ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This accounting guidance replaces the current "incurred loss" model for recognizing credit losses with an "expected loss" model, referred to as the Current Expected Credit Loss ("CECL") model. Under the CECL model, Peoples will be required to present certain financial assets carried at amortized cost, such as loans held-for-investment and held-to-maturity debt securities, at the net amount expected to be collected. ASU 2018-19 clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20, and should be accounted for according to Topic 842. The measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the "incurred loss" model required under current US GAAP, which delays recognition until it is probable a loss has been incurred. Accordingly, Peoples expects that the adoption of the CECL model will materially affect how the allowance for loan losses is determined and could require significant increases to the allowance for loan losses. Moreover, the CECL model may create more volatility in the level of Peoples' allowance for loan losses. If required to materially increase the level of allowance for loan losses for any reason, such increase could adversely affect Peoples' business, financial condition and results of operations. The new CECL standard will become effective for interim and annual reporting periods beginning after December 15, 2019 (effective January 1, 2020 for Peoples). Peoples has a committee that meets regularly to monitor progress and oversee the project. Peoples has implemented a third-party software solution, and is utilizing the tool to run test calculations throughout 2019 in anticipation of the full implementation at the beginning of 2020. Peoples will complete model validation during 2019, and is currently refining the economic forecasting process, documenting accounting policies, reviewing business processes and evaluating potential changes to the control environment. Peoples is presently evaluating the impact that the CECL model will have on Peoples' financial statements and expects to recognize a one-time cumulative-effect adjustment to the allowance for loan loss provision as of the beginning of the first reporting period in which the new standard is effective, consistent with regulatory expectations set forth in interagency guidance issued at the end of 2016. The impact of the adoption will depend on relevant data at the adoption date, including the characteristics of the loan portfolio, macroeconomic conditions and forecasts. Peoples has not yet determined the magnitude of any such one-time cumulative-effect adjustment or of the overall impact of the new standard on Peoples' financial condition or results of operations.

New Accounting Pronouncements: From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board ("FASB") or other standard setting bodies that are adopted by Peoples as of the required effective dates. The following accounting pronouncements should be read in conjunction with Note 1 Summary of Significant Accounting Policies of the Notes to the Consolidated Financial Statements included in Peoples’ 2018 Form 10-K.

Accounting Standards Update ("ASU") 2017-04 - Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendments in this ASU simplify how an entity is required to test goodwill for impairment by eliminating the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. This accounting guidance will be effective for interim and annual reporting periods beginning after December 15, 2019 (effective January 1, 2020 for Peoples). Peoples early adopted this new accounting guidance as of January 1, 2019, and it will be incorporated in the October 1, 2019 annual goodwill and intangible assets impairment analysis, but it is not expected to have a material impact on Peoples' consolidated financial statements.

ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. This accounting guidance replaces the current "incurred loss" model for recognizing credit losses with an "expected loss" model, referred to as the Current Expected Credit Loss ("CECL") model. Under the CECL model, Peoples will be required to present certain financial assets carried at amortized cost, such as loans held-for-investment and held-to-maturity debt securities, at the net amount expected to be collected. ASU 2018-19 clarified that receivables arising from operating leases are not within the scope of Subtopic 326-20, and should be accounted for according to Topic 842.

The measurement of expected credit losses is to be based on information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. This measurement will take place at the time the financial asset is first added to the balance sheet and periodically thereafter. This differs significantly from the "incurred loss" model required under current US GAAP, which delays recognition until it is probable a loss has been incurred. Accordingly, Peoples expects that the adoption of the CECL model will materially affect how the allowance for loan losses is determined and could require significant increases to the allowance for loan losses. Moreover, the CECL model may create more volatility in the level of Peoples' allowance for loan losses. If required to materially increase the level of allowance for loan losses for any reason, such increase could adversely affect Peoples' business, financial condition and results of operations.

The new CECL standard will become effective for interim and annual reporting periods beginning after December 15, 2019 (effective January 1, 2020 for Peoples). Peoples has a committee that meets regularly to monitor progress and oversee the project. Peoples has implemented a third-party software solution, and is utilizing the tool to run test calculations throughout 2019 in anticipation of the full implementation at the beginning of 2020. Peoples will complete model validation during 2019, and is currently refining the economic forecasting process, documenting accounting policies, reviewing business processes and evaluating potential changes to the control environment. Peoples is presently evaluating the impact that the CECL model will have on Peoples' financial statements and expects to recognize a one-time cumulative-effect adjustment to the allowance for loan loss provision as of the beginning of the first reporting period in which the new standard is effective, consistent with regulatory expectations set forth in interagency guidance issued at the end of 2016. The impact of the adoption will depend on relevant data at the adoption date, including the characteristics of the loan portfolio, macroeconomic conditions and forecasts. Peoples has not yet determined the magnitude of any such one-time cumulative-effect adjustment or of the overall impact of the new standard on Peoples' financial condition or results of operations.