Cover - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	1-13677
Entity Registrant Name	MID PENN BANCORP, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1666413
Entity Address, Address Line One	2407 Park Drive
Entity Address, City or Town	Harrisburg
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	17110
City Area Code	1.866
Local Phone Number	642.7736
Title of 12(b) Security	Common Stock, $1.00 par value per share
Trading Symbol	MPB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		16,668,569
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000879635
Amendment Flag	false