Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2018
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. Accounting Standards Update ("ASU") 2018-07 - Compensation - Stock Compensation (Topic 718): The update has been issued as part of a simplification initiative which will expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees and expands the scope through the amendments to address and improve aspects of the accounting for non-employee share-based payment transactions. The amendments will be effective for interim and annual reporting periods beginning after December 15, 2018 (effective January 1, 2019 for Peoples). Peoples will adopt this new accounting guidance as required, and it is not expected to have a material impact on Peoples' consolidated financial statements. ASU 2018-06 - Codification Improvements (Topic 942): The update has been issued to increase stakeholders' awareness of the improvements to Topic 942, Financial Services - Depository and Lending. The update will supersede outdated guidance related to the Office of the Comptroller of the Currency's Banking Circular 202, Accounting for Net Deferred Tax Charges. The amendments became effective May 7, 2018, and did not have an impact on Peoples' consolidated financial statements. ASU 2018-05 - Income Taxes (Topic 740): The amendments in this ASU clarify required disclosures in situations where a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting under ASC 740 for certain income tax effects of the Tax Cuts and Jobs Act for the reporting period. As of December 31, 2017, Peoples partially completed the accounting for the tax effects of enactment of the Tax Cuts and Jobs Act; however, in certain cases, Peoples made reasonable estimates of the effects of a reduced federal corporate income tax rate on its existing deferred tax balances. In other cases, Peoples has not been able to make a reasonable estimate and continued to account for those items based on its existing accounting under ASC 740, and the provisions of the tax laws that were in effect immediately prior to enactment of the Tax Cuts and Jobs Act. In all cases, Peoples will continue to make and refine its calculations during the one-year remeasurement period as additional analysis is completed. In addition, these estimates may be affected as Peoples gains a more thorough understanding of the new tax reform legislation. ASU 2018-02 - Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Peoples early adopted ASU 2018-02, reclassifying income tax effects of the Tax Cuts and Jobs Act of $0.9 million from accumulated other comprehensive loss to retained earnings as of December 31, 2017. ASU 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The objective of the amendments in this ASU is to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships, and the presentation of hedge results. To meet that objective, the amendments expand and refine hedge accounting for both nonfinancial and financial risk components, and align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The amendments will be effective for interim and annual reporting periods beginning after December 15, 2018 (effective January 1, 2019 for Peoples). Peoples will adopt this new accounting guidance as required, and 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. 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 is currently 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. Peoples has not yet determined the magnitude of any such one-time cumulative adjustment or of the overall impact of the new standard on Peoples' financial condition or results of operations. ASU 2016-02 - Leases (Topic 842): This ASU was issued to improve the financial reporting of leasing activities and provide a faithful representation of leasing transactions and improve understanding and comparability of a lessee's financial statements. Under the new accounting guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. This ASU will require both finance and operating leases to be recognized on the balance sheet. This ASU will affect all companies and organizations that lease real estate. The FASB issued an update in January 2018 (ASU 2018-01) providing an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and were not previously accounted for as leases. This ASU will become effective for interim and annual reporting periods beginning after December 15, 2018 (effective January 1, 2019 for Peoples). Peoples is currently identifying the current leases and will adopt this new accounting guidance as required, and it is not expected to have a material impact on Peoples' consolidated financial statements.

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.

Accounting Standards Update ("ASU") 2018-07 - Compensation - Stock Compensation (Topic 718): The update has been issued as part of a simplification initiative which will expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from non-employees and expands the scope through the amendments to address and improve aspects of the accounting for non-employee share-based payment transactions. The amendments will be effective for interim and annual reporting periods beginning after December 15, 2018 (effective January 1, 2019 for Peoples). Peoples will adopt this new accounting guidance as required, and it is not expected to have a material impact on Peoples' consolidated financial statements.

ASU 2018-06 - Codification Improvements (Topic 942): The update has been issued to increase stakeholders' awareness of the improvements to Topic 942, Financial Services - Depository and Lending. The update will supersede outdated guidance related to the Office of the Comptroller of the Currency's Banking Circular 202, Accounting for Net Deferred Tax Charges. The amendments became effective May 7, 2018, and did not have an impact on Peoples' consolidated financial statements.

ASU 2018-05 - Income Taxes (Topic 740): The amendments in this ASU clarify required disclosures in situations where a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete the accounting under ASC 740 for certain income tax effects of the Tax Cuts and Jobs Act for the reporting period. As of December 31, 2017, Peoples partially completed the accounting for the tax effects of enactment of the Tax Cuts and Jobs Act; however, in certain cases, Peoples made reasonable estimates of the effects of a reduced federal corporate income tax rate on its existing deferred tax balances. In other cases, Peoples has not been able to make a reasonable estimate and continued to account for those items based on its existing accounting under ASC 740, and the provisions of the tax laws that were in effect immediately prior to enactment of the Tax Cuts and Jobs Act. In all cases, Peoples will continue to make and refine its calculations during the one-year remeasurement period as additional analysis is completed. In addition, these estimates may be affected as Peoples gains a more thorough understanding of the new tax reform legislation.

ASU 2018-02 - Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Peoples early adopted ASU 2018-02, reclassifying income tax effects of the Tax Cuts and Jobs Act of $0.9 million from accumulated other comprehensive loss to retained earnings as of December 31, 2017.

ASU 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The objective of the amendments in this ASU is to better align an entity’s risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships, and the presentation of hedge results. To meet that objective, the amendments expand and refine hedge accounting for both nonfinancial and financial risk components, and align the recognition and presentation of the effects of the hedging instrument and the hedged item in the financial statements. The amendments will be effective for interim and annual reporting periods beginning after December 15, 2018 (effective January 1, 2019 for Peoples). Peoples will adopt this new accounting guidance as required, and 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.

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 is currently 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. Peoples has not yet determined the magnitude of any such one-time cumulative adjustment or of the overall impact of the new standard on Peoples' financial condition or results of operations.

ASU 2016-02 - Leases (Topic 842): This ASU was issued to improve the financial reporting of leasing activities and provide a faithful representation of leasing transactions and improve understanding and comparability of a lessee's financial statements. Under the new accounting guidance, a lessee will be required to recognize assets and liabilities for leases with lease terms of more than 12 months. This ASU will require both finance and operating leases to be recognized on the balance sheet. This ASU will affect all companies and organizations that lease real estate. The FASB issued an update in January 2018 (ASU 2018-01) providing an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and were not previously accounted for as leases. This ASU will become effective for interim and annual reporting periods beginning after December 15, 2018 (effective January 1, 2019 for Peoples). Peoples is currently identifying the current leases and will adopt this new accounting guidance as required, and it is not expected to have a material impact on Peoples' consolidated financial statements.