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Bank Premises and Equipment (Narrative) (Details)
12 Months Ended
Jan. 20, 2017
USD ($)
Property
Dec. 31, 2016
USD ($)
Lease
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Property, Plant and Equipment [Line Items]        
Depreciation   $ 1,658,000 $ 1,485,000 $ 1,235,000
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 due to Mid Penn’s intent to sell them during January 2017    
Gain from sale of three properties   $ (142,000)   (18,000)
Lease expiration date   Dec. 31, 2035    
2017   $ 1,121,000    
2018   1,115,000    
2019   1,116,000    
2020   793,000    
2021   582,000    
thereafter   $ 5,666,000    
Operating Leases Related Party [Member]        
Property, Plant and Equipment [Line Items]        
Number of operating lease with related parties | Lease   4    
Operating leases, rent expense, net   $ 348,000 $ 279,000 $ 54,000
2017   346,000    
2018   302,000    
2019   304,000    
2020   305,000    
2021   213,000    
thereafter   $ 2,118,000    
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    
Sublease to Unrelated Party [Member] | First Sublease Agreement [Member]        
Property, Plant and Equipment [Line Items]        
Lease agreement start date   Apr. 01, 2016    
Sublease to Unrelated Party [Member] | Second Sublease Agreement [Member]        
Property, Plant and Equipment [Line Items]        
Lease agreement start date   Jul. 01, 2016    
Subsequent Event        
Property, Plant and Equipment [Line Items]        
Number of properties sale | Property 3      
Proceeds from sale of three properties $ 2,240,000      
Gain from sale of three properties $ 346,000      
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.      
Subsequent Event | Minimum [Member]        
Property, Plant and Equipment [Line Items]        
Length of lease 15 years      
Other Expense [Member]        
Property, Plant and Equipment [Line Items]        
Asset held for sale, impairment charge on one of the properties   $ 142,000