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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Mar. 02, 2020
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Dec. 31, 2019  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2019  
Trading Symbol MPB  
Entity Registrant Name MID PENN BANCORP INC  
Entity Central Index Key 0000879635  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Shell Company false  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   8,480,938
Entity Current Reporting Status Yes  
Entity Public Float $ 172,221,118  
Entity Voluntary Filers No  
Entity Well-known Seasoned Issuer No  
Entity File Number 1-13677  
Entity Tax Identification Number 25-1666413  
Entity Address, Address Line One 349 Union Street  
Entity Address, City or Town Millersburg  
Entity Address, State or Province PA  
Entity Address, Postal Zip Code 17061  
City Area Code 1.866  
Local Phone Number 642.7736  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code PA  
Title of 12(b) Security Common Stock, $1.00 par value per share  
Security Exchange Name NASDAQ  
Document Annual Report true  
Document Transition Report false  
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the registrant’s definitive proxy statement to be used in connection with the 2020 Annual Meeting of Shareholders is incorporated herein by reference in partial response to Part III, hereof.