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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 01, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
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    
ICFR Auditor Attestation Flag true    
Entity Common Stock, Shares Outstanding   8,413,383  
Entity Current Reporting Status Yes    
Entity Public Float     $ 126,417,268
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 2021 Annual Meeting of Shareholders is incorporated herein by reference in partial response to Part III, hereof.