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Summary of Significant Accounting Policies (Narrative) (Details) |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2021 USD ($) Customer Individual | Oct. 31, 2020 USD ($) | Feb. 18, 2021 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) Apartment shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2020 USD ($) shares | Aug. 26, 2020 shares | Aug. 25, 2020 shares | May 14, 2019 shares | May 13, 2019 shares | Jul. 31, 2018 USD ($) | Jan. 08, 2018 USD ($) | Jun. 25, 2014 shares | May 06, 2014 shares
Cash reserve balances |  |  |  |  | $ 0 | $ 0 |  | $ 0 |  |  |  |  |  |  |  |
Net gain on sales of investment securities |  |  |  |  | 467,000 | 1,878,000 | $ 137,000 |  |  |  |  |  |  |  |  |
Loans and leases receivable, net, carrying amount |  |  |  |  | 2,370,659,000 | 1,753,241,000 |  | 2,370,659,000 |  |  |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount |  |  |  |  | 2,384,041,000 | 1,762,756,000 | 1,624,067,000 | 2,384,041,000 |  |  |  |  |  |  |  |
Loans and leases, net of unearned interest |  |  |  |  | 276,701,000 | 414,498,000 |  | 276,701,000 |  |  |  |  |  |  |  |
Bank premises and equipment held for sale |  |  |  |  | $ 210,000,000 | 0 |  | 210,000,000 |  |  |  |  |  |  |  |
Asset held for sale, description |  |  |  |  | Bank premises and equipment designated as held for sale are carried at the lower of cost or market value, and, at December 31, 2020, totaled $210,000 related to a retail banking property which was closed and listed for sale on December 31, 2020. There were no premises and equipment classified as held for sale as of December 31, 2019. During 2019, Mid Penn sold the land and facility formerly used as a full-service retail banking property. |  |  |  |  |  |  |  |  |  |  |
Other securities |  |  |  |  | $ 1,253,000 | $ 782,000 | $ 595,000 |  |  |  |  |  |  |  |  |
Federal tax rate |  |  |  |  | 21.00% | 21.00% | 21.00% |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 62,840,000 | $ 62,840,000 |  | 62,840,000 |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 0 |  |  |  | 0 | $ 0 |  |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  | 1,398,000 | 1,430,000 | 1,224,000 |  |  |  |  |  |  |  |  |
Residential real estate held in other real estate owned |  |  |  |  | 134,000 | 78,000 |  | 134,000 |  |  |  |  |  |  |  |
Foreclosure proceedings in process |  |  |  |  | 13,000 | 84,000 |  | 13,000 |  |  |  |  |  |  |  |
Mortgage servicing rights |  |  |  |  | 49,000 | 78,000 |  | 49,000 |  |  |  |  |  |  |  |
Mortgage servicing rights, amortization |  |  |  |  | 29,000 | 28,000 | 20,000 |  |  |  |  |  |  |  |  |
Impairment of mortgage servicing rights |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Principal balance of loans serviced |  |  |  |  | 9,384,000 | 12,357,000 |  | 9,384,000 |  |  |  |  |  |  |  |
Carrying value of investment in limited partnership |  |  |  |  | $ 146,000 | 190,000 |  | 146,000 |  |  |  |  |  |  |  |
Low Income Housing Tax Credit |  |  |  |  |  | 31,000 | $ 76,000 |  |  |  |  |  |  |  |  |
Number of apartments under the project | Apartment |  |  |  |  | 37 |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment in limited partnership |  |  |  |  | $ 146,000 | $ 190,000 |  | 146,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Liabilities of funded status |  |  |  |  | 461,000 | $ 183,000 |  | 461,000 |  |  |  |  |  |  |  |
Settlement gains recognized |  |  |  |  | 3,000 | 34,000 |  |  |  |  |  |  |  |  |  |
Trust assets |  |  |  |  | $ 148,621,000 | $ 152,492,000 |  | $ 148,621,000 |  |  |  |  |  |  |  |
Common Stock, Shares Authorized | shares |  |  |  |  | 20,000,000 | 20,000,000 |  | 20,000,000 | 200,000 | 100,000 | 20,000,000 | 10,000,000 |  |  |  |
Number of antidilutive shares | shares |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
2014 Restricted Stock Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized per plan | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 100,000
Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of investment in limited partnership |  |  |  |  | $ 6,682,000 | $ 7,249,000 |  | $ 6,682,000 |  |  |  |  |  |  |  |
Carrying value of investment in limited partnership |  |  |  |  | $ 6,682,000 | 7,249,000 |  | 6,682,000 |  |  |  |  |  |  |  |
Core Deposit Intangible [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core Deposit Intangible, Amortization Period |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Intangible assets, net |  |  |  |  | $ 4,311,000 | 5,526,000 |  | 4,311,000 |  |  |  |  |  |  |  |
Amortization expense |  |  |  |  | 1,215,000 | 1,367,000 | $ 188,000 |  |  |  |  |  |  |  |  |
Impairment of core deposit intangible |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Intangible assets, growth recognized |  |  |  |  | $ 562,186,000 |  |  |  |  |  |  |  |  |  |  |
Finite Lived Intangible Assets Growth Percentage |  |  |  |  | 29.00% |  |  |  |  |  |  |  |  |  |  |
First Priority Financial Corp. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,744,000 |  |  |
Goodwill acquired |  |  |  |  | $ 39,744,000 | 39,744,000 |  |  |  |  |  |  |  |  |  |
Scottdale Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,178,000 |  |
Goodwill acquired |  |  |  |  | 19,178,000 | 19,178,000 |  |  |  |  |  |  |  |  |  |
Phoenix Bancorp Incorporated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | 3,918,000 | 3,918,000 |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank of Pittsburgh [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other securities |  |  |  |  | 360,000 | 424,000 | $ 275,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 66,000 | 80,000 |  | $ 66,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount | $ 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of business customers for which loan disbursements are made | Customer | 2,047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of individuals, business customers employ | Individual | 26,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Loan to value ratio |  |  |  |  | 80.00% |  |  | 80.00% |  |  |  |  |  |  |  |
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 |  |  |  |  | $ 20,883,000 |  |  |  |  |  |  |  |  |  |  |
Loan processing fees |  |  |  |  | 13,137,000 |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, net, carrying amount |  |  |  |  | 388,313,000 |  |  | $ 388,313,000 |  |  |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount |  |  |  |  | 396,059,000 |  |  | 396,059,000 |  |  |  |  |  |  |  |
Deferred loan processing fees |  |  |  |  | 7,746,000 |  |  | 7,746,000 |  |  |  |  |  |  |  |
Loss reserve |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Small Business Administration [Member] | PPP Loans [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan processing fees |  |  | $ 12,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities, fair value |  |  |  |  | 515,000 | 507,000 |  | 515,000 |  |  |  |  |  |  |  |
Equity Securities [Member] | Accounting Standards Update 2016-01 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities, fair value |  |  |  |  | 515,000 | 507,000 |  | 515,000 |  |  |  |  |  |  |  |
Equity securities sold |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Preferred stock of another financial institution, purchased and subsequently sold |  |  |  |  | 1,000,000 |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Net gain on sales of investment securities |  |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |  |
Equity Securities [Member] | Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized losses reclassified |  |  |  |  | $ 44,000 |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Residential Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |
Loan to value ratio |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |  |  |
Loan to value ratio, exposure after private mortgage insurance |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Small Business Administration [Member] | PPP Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans maturity term |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Processing fee percentage |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] | Home equity lines of credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |
Loan to value ratio |  |  |  |  | 85.00% |  |  | 85.00% |  |  |  |  |  |  |  |
Maximum [Member] | Home Equity Lines Of Credit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  | 5 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 |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Small Business Administration [Member] | PPP Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Processing fee percentage |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] | Small Business Administration [Member] | PPP Loans [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount |  |  | $ 290,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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