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Summary of Significant Accounting Policies (Narrative) (Details) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) | Jan. 02, 2019 USD ($) | Mar. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) shares | Jun. 30, 2018 USD ($) Apartment | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) Branch
Loans and leases, net of unearned interest |  |  | $ 373,225,000 | $ 414,498,000 |  |  | $ 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 March 31, 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 | 78,000 |  |  | 78,000 |
Foreclosure proceedings in process |  |  | 97,000 | 84,000 |  |  | 84,000 |
Operating lease right of use asset |  |  | 10,999,000 | 11,442,000 |  |  | 11,442,000 |
Operating lease liability |  |  | 12,070,000 | 12,544,000 |  |  | 12,544,000 |
Carrying value of investment in limited partnership |  |  | 179,000 | $ 190,000 |  |  | $ 190,000 |
Number of apartments under the project | Apartment |  |  |  |  |  | 37 |  |
Limited partner capital contribution commitment |  |  |  |  |  | $ 7,579,000 |  |
Project investment amortization period |  |  |  | 10 years |  | 10 years | 10 years |
Annual LIHTCs mount awarded for the project |  |  |  |  |  | $ 861,000 |  |
Total anticipated LIHTCs amount under the housing project |  |  |  |  |  | $ 8,613,000 |  |
Amortization expense |  |  | 323,000 |  | $ 363,000 |  |  |
Goodwill |  |  | 62,840,000 | $ 62,840,000 |  |  | $ 62,840,000 |
Goodwill, Impairment Loss | $ 0 |  | 0 |  |  |  |  |
Decrease in fair value of plan assets |  |  | (535,000) |  |  |  |  |
Decrease in accumulated other comprehensive (loss) income, net of taxes |  |  | $ (535,000) |  |  |  |  |
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 |  |  | 5,215,000 | 5,526,000 |  |  | 5,526,000 |
Amortization expense |  |  | $ 310,000 |  | $ 348,000 |  |  |
Core Deposit Intangible, Amortization Period |  |  | 10 years |  |  |  |  |
Impairment of core deposit intangible |  |  | $ 0 |  |  |  |  |
Intangible assets, growth recognized |  |  | $ 60,887,000 |  |  |  |  |
Finite Lived Intangible Assets Growth Percentage |  |  | 3.20% |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |
Carrying value of investment in limited partnership |  |  | $ 7,250,000 | 7,249,000 |  |  | 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 |  |  | $ 80,000 | 80,000 |  |  | 80,000 |
Maximum [Member] |  |  |  |  |  |  |  |
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period |  |  | 120 days |  |  |  |  |
Commercial Portfolio [Member] |  |  |  |  |  |  |  |
Loan terms |  |  | 1 year |  |  |  |  |
Loan to value ratio |  |  | 80.00% |  |  |  |  |
Residential Portfolio [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Loan terms |  |  | 30 years |  |  |  |  |
Loan to value ratio |  |  | 100.00% |  |  |  |  |
Loan to value ratio, exposure after private mortgage insurance |  |  | 85.00% |  |  |  |  |
ASU 842 [Member] |  |  |  |  |  |  |  |
Operating lease right of use asset |  |  |  |  |  |  |  | $ 11,661,000
Operating lease liability |  |  |  |  |  |  |  | $ 12,866,000
opening adjustment to retained earnings |  | $ 316,000 |  |  |  |  |  |
Number of retail branch location | Branch |  |  |  |  |  |  |  | 2
Equity Securities [Member] |  |  |  |  |  |  |  |
Equity securities, fair value |  |  | $ 515,000 | 507,000 |  |  | 507,000 |
Equity Securities [Member] | ASU 2016-01 [Member] |  |  |  |  |  |  |  |
Equity securities, fair value |  |  | 515,000 | $ 507,000 |  |  | $ 507,000 |
Equity securities sold |  |  | $ 0 |  | $ 0 |  |  |
Home equity lines of credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Loan terms |  |  | 20 years |  |  |  |  |
Loan to value ratio |  |  | 85.00% |  |  |  |  |
Home Equity Lines Of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Loan terms |  |  | 5 years |  |  |  |  |

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