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Bank Premises and Equipment (Narrative) (Details)
 12 Months Ended
Jan. 20, 2017
USD ($)
Property
Dec. 31, 2018
USD ($)
Lease
Dec. 31, 2017
USD ($)
Administrative_Office
Dec. 31, 2016
USD ($)
Lease
Property, Plant and Equipment [Line Items]        
Bank premises and equipment held for sale   $ 0 $ 0  
Asset held for sale, description   As of December 31, 2016, assets held-for-sale consisted of three full service retail banking properties. These properties were transferred from land and buildings to assets held for sale during 2016 due to Mid Penn’s intent to sell them during January 2017.    
Number of properties sale | Property 3      
Proceeds from sale of three properties $ 2,240,000   2,201,000  
Gain from sale of three properties $ 346,000 $ (71,000) (14,000) $ (142,000)
Depreciation   $ 2,395,000 $ 1,464,000 $ 1,658,000
Lease expiration date   Dec. 31, 2035    
2019   $ 2,171,000    
2020   1,970,000    
2021   1,603,000    
2022   1,464,000    
2023   1,245,000    
thereafter   $ 6,691,000    
Harrisburg, PA [Member] | Commercial Building and Adjacent Lots [Member]        
Property, Plant and Equipment [Line Items]        
Number of administrative offices previously leased, replaced | Administrative_Office     2  
Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Length of lease 15 years      
Sublease to Unrelated Party [Member]        
Property, Plant and Equipment [Line Items]        
Lease expiration date       Mar. 31, 2021
Number of operating lease with related parties | Lease       2
Operating Leases Related Party [Member]        
Property, Plant and Equipment [Line Items]        
Number of operating lease with related parties | Lease   3    
Operating leases, rent expense, net   $ 320,000 $ 352,000 $ 348,000
2019   208,000    
2020   214,000    
2021   186,000    
2022   175,000    
2023   175,000    
thereafter   $ 1,700,000    
Second Sublease Agreement [Member] | Sublease to Unrelated Party [Member]        
Property, Plant and Equipment [Line Items]        
Sale and lease back of properties, description   Two of the properties are being leased back by Mid Penn for a period of at least 15 years, and the respective gains on the sales of those properties will be recognized over the life of the leases.    
Lease agreement start date       Jul. 01, 2016
First Sublease Agreement [Member] | Sublease to Unrelated Party [Member]        
Property, Plant and Equipment [Line Items]        
Lease agreement start date       Apr. 01, 2016
Non Interest Expense [Member]        
Property, Plant and Equipment [Line Items]        
Asset held for sale, impairment charge on one of the properties       $ 142,000