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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 12 Months Ended 36 Months Ended
Oct. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Apartment
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2019
USD ($)
Jun. 25, 2014
shares
May 06, 2014
shares
Cash reserve balances       $ 0 $ 0   $ 0    
Bank premises and equipment held for sale       $ 0 0   0    
Asset held for sale, description       Bank premises and equipment designated as held for sale are carried at the lower of cost or market value. There were no premises and equipment classified as held for sale as of December 31, 2019 or 2018. During 2019, Mid Penn sold the land and facility formerly used as a full-service retail banking property.          
Other securities       $ 782,000 $ 595,000 $ 217,000      
Federal tax rate       21.00% 21.00% 34.00%      
Reduction in write-down of deferred tax asset           $ 1,169,000      
Goodwill, Impairment Loss $ 0       $ 0 0      
Amortization expense       $ 1,430,000 1,224,000 104,000      
Residential real estate held in other real estate owned       78,000 844,000   78,000    
Foreclosure proceedings in process       84,000 211,000   84,000    
Mortgage servicing rights       78,000 106,000   78,000    
Mortgage servicing rights, amortization       28,000 20,000 18,000      
Impairment of mortgage servicing rights             0    
Principal balance of loans serviced       12,357,000 15,601,000   12,357,000    
Carrying value of investment in limited partnership       $ 190,000 233,000   190,000    
Low Income Housing Tax Credit         76,000 $ 76,000      
Number of apartments under the project | Apartment     37            
Limited partner capital contribution commitment     $ 7,579,000            
Project investment amortization period     10 years 10 years          
Annual LIHTCs mount awarded for the project     $ 861,000            
Total anticipated LIHTCs amount under the housing project     $ 8,613,000            
Liabilities of funded status       $ 183,000 345,000   183,000    
Settlement gains recognized       34,000 737,000        
Trust assets       $ 152,492,000 $ 125,567,000   152,492,000    
Number of antidilutive shares | shares       0 0 0      
2014 Restricted Stock Plan [Member]                  
Shares authorized per plan | shares               100,000 100,000
Other Assets [Member]                  
Carrying value of investment in limited partnership       $ 7,249,000 $ 1,710,000   7,249,000    
Core Deposit Intangible [Member]                  
Core Deposit Intangible, Amortization Period       10 years          
Intangible assets, net       $ 5,526,000 6,893,000   5,526,000    
Amortization expense       1,367,000 1,188,000 $ 86,000      
Impairment of core deposit intangible       0 0 0      
First Priority Financial Corp. [Member]                  
Goodwill acquired       39,744,000 39,744,000        
Scottdale Bank and Trust Company [Member]                  
Goodwill acquired       19,178,000 19,178,000        
Phoenix Bancorp Incorporated [Member]                  
Goodwill acquired       3,918,000 3,918,000        
Scottdale and First Priority [Member] | 401(k) Plan [Member]                  
Defined contribution plan, associated expense       0 0        
Federal Home Loan Bank of Pittsburgh [Member]                  
Other securities       424,000 275,000 $ 114,000      
Non Interest Expense [Member]                  
Asset held for sale, impairment charge   $ 105,000              
Reserve for Off-balance Sheet Activities [Member]                  
Valuation allowances and reserves, balance       $ 80,000 159,000   $ 80,000    
Maximum [Member]                  
Maturity of interest bearing time deposits with other financial institutions       1 year          
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period       120 days     120 days    
Maximum [Member] | Building Assets [Member]                  
Property, plant and equipment, useful life       50 years          
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]                  
Property, plant and equipment, useful life       10 years          
Maximum [Member] | Land Improvements [Member]                  
Property, plant and equipment, useful life       20 years          
Maximum [Member] | Leasehold Improvements [Member]                  
Property, plant and equipment, useful life       15 years          
Minimum [Member] | Building Assets [Member]                  
Property, plant and equipment, useful life       5 years          
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]                  
Property, plant and equipment, useful life       3 years          
Minimum [Member] | Land Improvements [Member]                  
Property, plant and equipment, useful life       10 years          
Minimum [Member] | Leasehold Improvements [Member]                  
Property, plant and equipment, useful life       10 years          
Residential Portfolio [Member] | Maximum [Member]                  
Loan terms       30 years          
Loan to value ratio       100.00%     100.00%    
Loan to value ratio, exposure after private mortgage insurance       85.00%          
Commercial Portfolio [Member]                  
Loan terms       1 year          
Loan to value ratio       80.00%     80.00%    
Home equity lines of credit [Member] | Maximum [Member]                  
Loan terms       20 years          
Loan to value ratio       85.00%     85.00%    
Home Equity Lines Of Credit [Member] | Maximum [Member]                  
Loan terms       5 years          
Equity Securities [Member]                  
Equity securities, fair value       $ 507,000 492,000   $ 507,000    
Equity Securities [Member] | ASU 2016-01 [Member]                  
Equity securities, fair value       507,000 492,000   $ 507,000    
Equity securities sold       $ 0 0        
Equity Securities [Member] | ASU 2016-01 [Member] | Accumulated Other Comprehensive Loss [Member]                  
Net unrealized losses reclassified         $ 44,000