Recent Accounting Pronouncements	3 Months Ended
Mar. 31, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]
Recent Accounting Pronouncements	Adoption of New Accounting Pronouncements and Issued But Not Yet Effective Accounting Standards The following is a summary of new accounting pronouncements impacting Park's consolidated financial statements, and issued accounting standards not yet effective for Park: Adoption of New Accounting Pronouncements ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement: In August 2018, the FASB issued ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements for fair value measurements in Topic 820, Fair Value Measurement by removing, modifying and adding certain requirements. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted upon issuance of this ASU. An entity is permitted to early adopt and remove or modify disclosures upon issuance of the ASU and delay adoption of the additional disclosures until their effective date. The adoption of this guidance on January 1, 2020 did not have an impact on Park’s consolidated financial statements, but did impact disclosures. ASU 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting: In March 2020, the FASB issued ASU 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU are effective from March 12, 2020 through December 31, 2022. The adoption of this guidance did not have a material impact on Park's consolidated financial statements, but Park will consider this guidance as contracts are transitioned from LIBOR to another reference rate. Issued But Not Yet Effective Accounting Standards ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments: In June 2016, FASB issued ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new accounting guidance in this ASU replaces the incurred loss model with an expected loss model, which is referred to as the current expected credit loss ("CECL") model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables, HTM debt securities, and reinsurance receivables. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. The CECL model requires an entity to estimate credit losses over the life of an asset or off-balance sheet exposure. The new accounting guidance was to have been effective for Park for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2019. Section 4014 of the CARES Act provides financial institutions with optional temporary relief from having to comply with ASU 2016-13 including the CECL methodology for estimating the allowance for credit losses. This temporary relief will expire on the earlier of the date on which the national emergency concerning the COVID-19 outbreak declared by the President on March 15, 2020 terminates or December 31, 2020, with adoption being effective retrospectively as of January 1, 2020. Park elected to delay the implementation of CECL following the approval of the CARES Act. The CECL standard requires financial institutions to calculate an allowance utilizing a reasonable and supportable forecast period which Park has established as a one-year period. Much is still unknown about the economic impact of COVID-19 including the duration of the pandemic, future government programs that may be established as a result of the pandemic, and the resiliency of the U.S. economy, making any forecast subject to large fluctuations in the coming months. In this unprecedented situation, Park believes that adoption of the CECL model in the first quarter 2020 would have added an unnecessary level of subjectivity and volatility to the calculation of the allowance for credit losses. With the delay, management is currently evaluating the impact of adoption of this new accounting guidance on Park’s consolidated financial statements. Adoption will be applied through a one-time cumulative-effect adjustment to retained earnings as of January 1, 2020. Management has developed a qualitative credit model and is completing the process of validation. Management is still finalizing the analysis of qualitative factors, to capture inherent risks, which are not included within the quantitative credit model. Management, along with Park’s CECL Committee, is in the process of implementing the accounting, processes, controls and governance required to comply with the new accounting guidance. The Company is using a blend of multiple economic forecasts to estimate expected credit losses over a one-year reasonable and supportable forecast period and then revert, over a one-year period, to longer term historical loss experience to arrive at lifetime expected credit losses. The estimated change in the allowance for credit losses as compared to Park's historical ALLL is primarily due to required increases for residential mortgage, home equity, and installment loans to address the requirement to estimate lifetime expected credit losses and the remaining length of time to maturity for these loans as well as an increase in reserves on acquired non-impaired loans which have low reserve levels under the incurred loss accounting guidance. Offsetting declines in the allowance are expected for commercial and commercial real estate loans due to their short-term nature. Additionally, management expects an increase in the allowance for credit losses for unfunded commitments. While adoption of this ASU is expected to increase the allowance for credit losses, it will not change the overall credit risk in the Company's loan, lease and securities portfolios or the ultimate losses therein. The transition adjustment to increase the allowance will primarily result in a decrease to shareholders' equity, net of income taxes. The ultimate impact of the adoption of this ASU will depend on the composition of the loan, lease and securities portfolios, finalization of credit loss models, and macroeconomic conditions and forecasts that exist at the adoption date. ASU 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans: In August 2018, the FASB issued ASU 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this ASU modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by removing disclosures that are no longer considered cost beneficial, clarifying the specific requirements of disclosures and adding disclosure requirements identified as relevant. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The adoption of this guidance will not have an impact on Park’s consolidated financial statements, but will impact disclosures. ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses: In November 2018, the FASB issued ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses. The amendment in this ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Impairment of receivables arising from operating leases are to be accounted for in accordance with Topic 842, Leases. Park will consider this clarification in determining the appropriate adoption of ASU 2016-13. ASU 2019-04 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments: In April 2019, the FASB issued ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. This ASU includes amendments that clarify or address specific issues about certain aspects of the amendments in ASU 2016-01, Financial Instruments - Overall (Subtopic 925-10): Recognition and Measurement of Financial Assets and Financial Liabilities, ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. Park has already adopted ASU 2016-01. As a result, certain provisions in the amendments within ASU 2019-04 related to the same topics as ASU 2016-01 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The adoption of the provisions related to the same topics as ASU 2016-01 on January 1, 2020 did not have a material effect on Park’s consolidated financial statements. For the amendments related to Topic 326 that clarify or address specific aspects of ASU 2016-13, Park will consider these clarifications in determining the appropriate adoption of ASU 2016-13. Park has already adopted ASU 2017-12. As a result, the amendments within ASU 2019-04 related to the same topics as ASU 2017-12 are effective as of January 1, 2020. This ASU allows entities, like Park, that did not reclassify debt securities from HTM to AFS upon the adoption of ASU 2017-12 to reclassify these securities as of the adoption of ASU 2019-04. Park has considered this option and, effective September 1, 2019, reclassified all HTM debt securities to AFS. The transfer occurred at fair value and resulted in an unrealized gain, net of taxes, of $19.1 million being recorded in other comprehensive income. ASU 2019-05 - Financial Instruments - Credit Losses (Topic 326): In May 2019, the FASB issued ASU 2019-05 - Financial Instruments - Credit Losses (Topic 326). The amendments in this ASU provide entities that have certain instruments within the scope of Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost, with an option to irrevocably elect the fair value option in Subtopic 825-10, Financial Instruments - Overall, applied on an instrument-by-instrument basis for eligible instruments, upon adoption of Topic 326. Park will consider this amendment in determining the appropriate adoption of ASU 2016-13. ASU 2019-11 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses: In November 2019, the FASB issued ASU 2019-11 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses. This ASU represents changes to clarify, correct errors in, or improve the ASC related to five topics. The amendments make the ASC easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. Park will consider these clarifications and improvements in determining the appropriate adoption of ASU 2016-13. ASU 2019-20 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes: In December 2019, the FASB issued ASU 2019-20 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU includes amendments to simplify accounting for income taxes by removing certain exceptions and adding requirements with the intention of simplifying and clarifying existing guidance. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption is permitted. The adoption of this guidance will not have a material impact on Park's consolidated financial statements. ASU 2020-01 - Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815: In January 2020, the FASB issued ASU 2020-01 - Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. This ASU represents changes to clarify certain interactions between the guidance to account for certain equity securities under Topic 321, the guidance to account for investments under the equity method of accounting in Topic 323, and the guidance in Topic 815. These amendments improve current U.S. GAAP by reducing diversity in practice and increasing comparability of the accounting for these transactions. The amendments in this ASU are effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance will not have a material impact on Park's consolidated financial statements. ASU 2020-02 - Financial Instruments - Credit Losses (Topic 326) and Leases (Topic 842) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842): In February 2020, the FASB issued ASU 2020-02 - Financial Instruments - Credit Losses (Topic 326) and Leases (Topic 842) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842). This ASU represents changes to clarify or improve the ASC. The amendments make the ASC easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. It also addresses transition and open effective date information for Topic 842. Park will consider these clarifications and improvements in determining the appropriate adoption of ASU 2016-13. ASU 2020-03 - Codification Improvements to Financial Instruments: In March 2020, the FASB issued ASU 2020-03 - Codification Improvements to Financial Instruments. This ASU represents changes to clarify or improve the ASC related to seven topics. The amendments make the ASC easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. Issues 1, 2, 3, 4 and 5 are conforming amendments and for public entities were effective upon the issuance of the standard. Issues 6 and 7 are amendments that affect the guidance in ASU 2016-13. Park will consider these clarifications and improvements in determining the appropriate adoption of ASU 2016-13.

ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement: In August 2018, the FASB issued ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU modifies the disclosure requirements for fair value measurements in Topic 820, Fair Value Measurement by removing, modifying and adding certain requirements. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted upon issuance of this ASU. An entity is permitted to early adopt and remove or modify disclosures upon issuance of the ASU and delay adoption of the additional disclosures until their effective date. The adoption of this guidance on January 1, 2020 did not have an impact on Park’s consolidated financial statements, but did impact disclosures.

ASU 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting: In March 2020, the FASB issued ASU 2020-04 - Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. This ASU provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. The amendments in this ASU are effective from March 12, 2020 through December 31, 2022. The adoption of this guidance did not have a material impact on Park's consolidated financial statements, but Park will consider this guidance as contracts are transitioned from LIBOR to another reference rate.

ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments: In June 2016, FASB issued ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new accounting guidance in this ASU replaces the incurred loss model with an expected loss model, which is referred to as the current expected credit loss ("CECL") model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables, HTM debt securities, and reinsurance receivables. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. The CECL model requires an entity to estimate credit losses over the life of an asset or off-balance sheet exposure. The new accounting guidance was to have been effective for Park for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2019.

Section 4014 of the CARES Act provides financial institutions with optional temporary relief from having to comply with ASU 2016-13 including the CECL methodology for estimating the allowance for credit losses. This temporary relief will expire on the earlier of the date on which the national emergency concerning the COVID-19 outbreak declared by the President on March 15, 2020 terminates or December 31, 2020, with adoption being effective retrospectively as of January 1, 2020.

With the delay, management is currently evaluating the impact of adoption of this new accounting guidance on Park’s consolidated financial statements. Adoption will be applied through a one-time cumulative-effect adjustment to retained earnings as of January 1, 2020. Management has developed a qualitative credit model and is completing the process of validation. Management is still finalizing the analysis of qualitative factors, to capture inherent risks, which are not included within the quantitative credit model. Management, along with Park’s CECL Committee, is in the process of implementing the accounting, processes, controls and governance required to comply with the new accounting guidance.

The Company is using a blend of multiple economic forecasts to estimate expected credit losses over a one-year reasonable and supportable forecast period and then revert, over a one-year period, to longer term historical loss experience to arrive at lifetime expected credit losses. The estimated change in the allowance for credit losses as compared to Park's historical ALLL is primarily due to required increases for residential mortgage, home equity, and installment loans to address the requirement to estimate lifetime expected credit losses and the remaining length of time to maturity for these loans as well as an increase in reserves on acquired non-impaired loans which have low reserve levels under the incurred loss accounting guidance. Offsetting declines in the allowance are expected for commercial and commercial real estate loans due to their short-term nature. Additionally, management expects an increase in the allowance for credit losses for unfunded commitments.

While adoption of this ASU is expected to increase the allowance for credit losses, it will not change the overall credit risk in the Company's loan, lease and securities portfolios or the ultimate losses therein. The transition adjustment to increase the allowance will primarily result in a decrease to shareholders' equity, net of income taxes. The ultimate impact of the adoption of this ASU will depend on the composition of the loan, lease and securities portfolios, finalization of credit loss models, and macroeconomic conditions and forecasts that exist at the adoption date.

ASU 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans: In August 2018, the FASB issued ASU 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this ASU modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by removing disclosures that are no longer considered cost beneficial, clarifying the specific requirements of disclosures and adding disclosure requirements identified as relevant. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The adoption of this guidance will not have an impact on Park’s consolidated financial statements, but will impact disclosures.

in this ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Impairment of receivables arising from operating leases are to be accounted for in accordance with Topic 842, Leases. Park will consider this clarification in determining the appropriate adoption of ASU 2016-13.

ASU 2019-04 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments: In April 2019, the FASB issued ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments. This ASU includes amendments that clarify or address specific issues about certain aspects of the amendments in ASU 2016-01, Financial Instruments - Overall (Subtopic 925-10): Recognition and Measurement of Financial Assets and Financial Liabilities, ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities.

Park has already adopted ASU 2016-01. As a result, certain provisions in the amendments within ASU 2019-04 related to the same topics as ASU 2016-01 are effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. The adoption of the provisions related to the same topics as ASU 2016-01 on January 1, 2020 did not have a material effect on Park’s consolidated financial statements.

Park has already adopted ASU 2017-12. As a result, the amendments within ASU 2019-04 related to the same topics as ASU 2017-12 are effective as of January 1, 2020. This ASU allows entities, like Park, that did not reclassify debt securities from HTM to AFS upon the adoption of ASU 2017-12 to reclassify these securities as of the adoption of ASU 2019-04. Park has considered this option and, effective September 1, 2019, reclassified all HTM debt securities to AFS. The transfer occurred at fair value and resulted in an unrealized gain, net of taxes, of $19.1 million being recorded in other comprehensive income.

ASU 2019-05 - Financial Instruments - Credit Losses (Topic 326): In May 2019, the FASB issued ASU 2019-05 - Financial Instruments - Credit Losses (Topic 326). The amendments in this ASU provide entities that have certain instruments within the scope of Subtopic 326-20, Financial Instruments - Credit Losses - Measured at Amortized Cost, with an option to irrevocably elect the fair value option in Subtopic 825-10, Financial Instruments - Overall, applied on an instrument-by-instrument basis for eligible instruments, upon adoption of Topic 326. Park will consider this amendment in determining the appropriate adoption of ASU 2016-13.

ASU 2019-11 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses: In November 2019, the FASB issued ASU 2019-11 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses. This ASU represents changes to clarify, correct errors in, or improve the ASC related to five topics. The amendments make the ASC easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. Park will consider these clarifications and improvements in determining the appropriate adoption of ASU 2016-13.

ASU 2019-20 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes: In December 2019, the FASB issued ASU 2019-20 - Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This ASU includes amendments to simplify accounting for income taxes by removing certain exceptions and adding requirements with the intention of simplifying and clarifying existing guidance. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption is permitted. The adoption of this guidance will not have a material impact on Park's consolidated financial statements.

ASU 2020-01 - Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815: In January 2020, the FASB issued ASU 2020-01 - Investments - Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815) - Clarifying the Interactions between Topic 321, Topic 323, and Topic 815. This ASU represents changes to clarify certain interactions between the guidance to account for certain equity securities under Topic 321, the guidance to account for investments under the equity method of accounting in Topic 323, and the guidance in Topic 815. These amendments improve current U.S. GAAP by reducing diversity in practice and increasing comparability of the accounting for these transactions. The amendments in this ASU are effective for fiscal years beginning after December 15, 2020, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance will not have a material impact on Park's consolidated financial statements.

ASU 2020-02 - Financial Instruments - Credit Losses (Topic 326) and Leases (Topic 842) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842): In February 2020, the FASB issued ASU 2020-02 - Financial Instruments - Credit Losses (Topic 326) and Leases (Topic 842) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842). This ASU represents changes to clarify or improve the ASC. The amendments make the ASC easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. It also addresses transition and open effective date information for Topic 842. Park will consider these clarifications and improvements in determining the appropriate adoption of ASU 2016-13.

ASU 2020-03 - Codification Improvements to Financial Instruments: In March 2020, the FASB issued ASU 2020-03 - Codification Improvements to Financial Instruments. This ASU represents changes to clarify or improve the ASC related to seven topics. The amendments make the ASC easier to understand and easier to apply by eliminating inconsistencies and providing clarifications. Issues 1, 2, 3, 4 and 5 are conforming amendments and for public entities were effective upon the issuance of the standard. Issues 6 and 7 are amendments that affect the guidance in ASU 2016-13. Park will consider these clarifications and improvements in determining the appropriate adoption of ASU 2016-13.