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Summary of Significant Accounting Policies (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Apartment
shares
Jun. 30, 2019
USD ($)
shares
Dec. 31, 2019
USD ($)
Jan. 02, 2019
USD ($)
Jan. 01, 2019
USD ($)
Branch
Loans and leases receivable, gross, carrying amount   $ 2,445,765,000 $ 1,688,173,000 $ 2,445,765,000 $ 1,688,173,000 $ 1,762,756,000    
Loans and leases, net of unearned interest   324,159,000   324,159,000   414,498,000    
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 June 30, 2020 or December 31, 2019. During 2019, Mid Penn sold the land and facility formerly used as a full-service retail banking property.        
Residential real estate held in other real estate owned   135,000   $ 135,000   78,000    
Foreclosure proceedings in process   90,000   90,000   84,000    
Operating lease right of use asset   10,587,000   10,587,000   11,442,000    
Operating lease liability   11,643,000   11,643,000   12,544,000    
Retained earnings   58,069,000   58,069,000   50,891,000    
Carrying value of investment in limited partnership   168,000   $ 168,000   $ 190,000    
Number of apartments under the project | Apartment       37        
Limited partner capital contribution commitment   7,579,000   $ 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   8,613,000        
Amortization expense   326,000 360,000 649,000 $ 723,000      
Goodwill   62,840,000   62,840,000   $ 62,840,000    
Goodwill, Impairment Loss $ 0     0        
Decrease in fair value of plan assets       (620,000)        
Decrease in accumulated other comprehensive (loss) income, net of taxes       $ (620,000)        
Number of antidilutive shares | shares       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    
Core Deposit Intangible [Member]                
Intangible assets, net   4,907,000   4,907,000   5,526,000    
Amortization expense   309,000 347,000 $ 619,000 $ 695,000      
Core Deposit Intangible, Amortization Period       10 years        
Impairment of core deposit intangible       $ 0        
Intangible assets, growth recognized       $ 413,919,000        
Finite Lived Intangible Assets Growth Percentage       21.00%        
Other Assets [Member]                
Carrying value of investment in limited partnership   7,061,000   $ 7,061,000   7,249,000    
Non Interest Expense [Member]                
Asset held for sale, impairment charge       0 105,000      
Reserve for Off-balance Sheet Activities [Member]                
Valuation allowances and reserves, balance   $ 77,000   $ 77,000   77,000    
Maximum [Member]                
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period   120 days   120 days        
Commercial Portfolio [Member]                
Loan terms       1 year        
Loan to value ratio   80.00%   80.00%        
Loans and leases receivable, gross, carrying amount     301,271,000   301,271,000      
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%        
Small Business Administration [Member] | PPP Loans [Member]                
Loan guarantee description       The PPP loans, which are 100 percent guaranteed by the Small Business Administration (“SBA”), have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term.        
Nonrefundable loan processing fees received       $ 20,329,000        
Loan processing fees       2,371,000        
Loans and leases receivable, gross, carrying amount   $ 588,667,000   588,667,000        
Deferred loan processing fees   17,958,000   17,958,000        
Loss reserve       $ 0        
Small Business Administration [Member] | Maximum [Member] | PPP Loans [Member]                
Loans maturity term       2 years        
ASU 842 [Member]                
Operating lease right of use asset               $ 11,661,000
Operating lease liability               $ 12,866,000
Number of retail branch location | Branch               2
ASU 842 [Member] | Adjustment [Member]                
Retained earnings             $ 316,000  
Equity Securities [Member]                
Equity securities, fair value   518,000   $ 518,000   507,000    
Equity Securities [Member] | ASU 2016-01 [Member]                
Equity securities, fair value   518,000   518,000   $ 507,000    
Equity securities sold   $ 0 $ 0 $ 0 $ 0      
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