Basis of Presentation	3 Months Ended
Mar. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	(1)Basis of Presentation The accompanying consolidated financial statements include the accounts of Mid Penn Bancorp, Inc. (“Mid Penn” or the “Company”) and its wholly-owned subsidiary, Mid Penn Bank (the “Bank”). All material intercompany accounts and transactions have been eliminated in consolidation. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Mid Penn believes the information presented is not misleading and the disclosures are adequate. For comparative purposes, the March 31, 2018 and December 31, 2018 balances have been reclassified, when, and if necessary, to conform to the 2019 presentation. Such reclassifications had no impact on net income. The results of operations for interim periods are not necessarily indicative of operating results expected for the full year. In the opinion of management, all adjustments necessary for fair presentation of the periods presented have been reflected in the accompanying consolidated financial statements. All such adjustments are of a normal, recurring nature. These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The comparability of the financial condition and results of operations as of and for the three months ended March 31, 2019 and 2018, in general, have been materially impacted by the acquisitions of First Priority Financial Corp. (“First Priority”) on July 31, 2018 and the acquisition of The Scottdale Bank & Trust Company (“Scottdale”) on January 8, 2018. Refer to Note 3, Acquisition of First Priority Financial Corp,. and Note 4, Acquisition of The Scottdale Bank & Trust Company, for additional information. Mid Penn has evaluated events and transactions occurring subsequent to the balance sheet date of March 31, 2019, for items that should potentially be recognized or disclosed in these consolidated financial statements. The evaluation was conducted through the issuance date of these consolidated financial statements.

Basis of Presentation

3 Months Ended

Mar. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

(1)Basis of Presentation

The accompanying consolidated financial statements include the accounts of Mid Penn Bancorp, Inc. (“Mid Penn” or the “Company”) and its wholly-owned subsidiary, Mid Penn Bank (the “Bank”). All material intercompany accounts and transactions have been eliminated in consolidation.

Certain information and disclosures normally included in consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Mid Penn believes the information presented is not misleading and the disclosures are adequate. For comparative purposes, the March 31, 2018 and December 31, 2018 balances have been reclassified, when, and if necessary, to conform to the 2019 presentation. Such reclassifications had no impact on net income. The results of operations for interim periods are not necessarily indicative of operating results expected for the full year. In the opinion of management, all adjustments necessary for fair presentation of the periods presented have been reflected in the accompanying consolidated financial statements. All such adjustments are of a normal, recurring nature. These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

The comparability of the financial condition and results of operations as of and for the three months ended March 31, 2019 and 2018, in general, have been materially impacted by the acquisitions of First Priority Financial Corp. (“First Priority”) on July 31, 2018 and the acquisition of The Scottdale Bank & Trust Company (“Scottdale”) on January 8, 2018. Refer to Note 3, Acquisition of First Priority Financial Corp,. and Note 4, Acquisition of The Scottdale Bank & Trust Company, for additional information.

Mid Penn has evaluated events and transactions occurring subsequent to the balance sheet date of March 31, 2019, for items that should potentially be recognized or disclosed in these consolidated financial statements. The evaluation was conducted through the issuance date of these consolidated financial statements.