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Regulatory Matters (Regulatory Capital Levels And Related Ratios) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Total Capital (To Risk Weighted Assets), Ratio |  | 1250.00% |
Tier 1 Capital for Capital Adequacy (To Average Assets), Ratio |  | 4.00% |
Common Equity Tier 1 Capital for Capital Adequacy (to Risk Weighted Assets), ratio |  | 4.50% |
Tier 1 Capital for Capital Adequacy (To Risk Weighted Assets), Ratio |  | 6.00% | 4.00%
Total Capital for Capital Adequacy (To Risk Weighted Assets), Ratio |  | 8.00% |
Mid Penn Bancorp, Inc. [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Capital (To Average Assets) |  | $ 168,146 | $ 155,662
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  | 168,146 | 155,662
Tier 1 Capital (To Risk Weighted Assets) |  | 168,146 | 155,662
Total Capital (To Risk Weighted Assets) |  | $ 204,811 | $ 191,300
Tier 1 Capital (to Average Assets), Ratio |  | 7.80% | 8.00%
Common Equity Tier 1 Capital (to Risk Weighted Assets), ratio |  | 9.80% | 10.00%
Tier 1 Capital (To Risk Weighted Assets), Ratio |  | 9.80% | 10.00%
Total Capital (To Risk Weighted Assets), Ratio |  | 11.90% | 12.30%
Tier 1 Capital for Capital Adequacy (To Average Assets) | [1] | $ 86,773 | $ 77,499
Common Equity Tier 1 Capital for Capital Adequacy (to Risk Weighted Assets) | [1] | 120,020 | 98,977
Tier 1 Capital for Capital Adequacy (To Risk Weighted Assets) | [1] | 145,738 | 122,265
Total Capital for Capital Adequacy (To Risk Weighted Assets) | [1] | $ 180,030 | $ 153,317
Tier 1 Capital for Capital Adequacy (To Average Assets), Ratio | [1] | 4.00% | 4.00%
Common Equity Tier 1 Capital for Capital Adequacy (to Risk Weighted Assets), ratio | [1] | 7.00% | 6.375%
Tier 1 Capital for Capital Adequacy (To Risk Weighted Assets), Ratio | [1] | 8.50% | 7.875%
Total Capital for Capital Adequacy (To Risk Weighted Assets), Ratio | [1] | 10.50% | 9.875%
Mid Penn Bank [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Capital (To Average Assets) |  | $ 185,101 | $ 171,776
Common Equity Tier 1 Capital (to Risk Weighted Assets) |  | 185,101 | 171,776
Tier 1 Capital (To Risk Weighted Assets) |  | 185,101 | 171,776
Total Capital (To Risk Weighted Assets) |  | $ 204,196 | $ 180,332
Tier 1 Capital (to Average Assets), Ratio |  | 8.50% | 8.90%
Common Equity Tier 1 Capital (to Risk Weighted Assets), ratio |  | 10.80% | 11.10%
Tier 1 Capital (To Risk Weighted Assets), Ratio |  | 10.80% | 11.10%
Total Capital (To Risk Weighted Assets), Ratio |  | 11.90% | 11.60%
Tier 1 Capital for Capital Adequacy (To Average Assets) | [1] | $ 86,760 | $ 77,230
Common Equity Tier 1 Capital for Capital Adequacy (to Risk Weighted Assets) | [1] | 119,995 | 98,963
Tier 1 Capital for Capital Adequacy (To Risk Weighted Assets) | [1] | 145,708 | 122,248
Total Capital for Capital Adequacy (To Risk Weighted Assets) | [1] | $ 179,992 | $ 153,295
Tier 1 Capital for Capital Adequacy (To Average Assets), Ratio | [1] | 4.00% | 4.00%
Common Equity Tier 1 Capital for Capital Adequacy (to Risk Weighted Assets), ratio | [1] | 7.00% | 6.375%
Tier 1 Capital for Capital Adequacy (To Risk Weighted Assets), Ratio | [1] | 8.50% | 7.875%
Total Capital for Capital Adequacy (To Risk Weighted Assets), Ratio | [1] | 10.50% | 9.875%
Tier 1 Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Average Assets) |  | $ 108,450 | $ 96,537
Common Equity Tier 1 Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Risk Weighted Assets) |  | 111,424 | 100,903
Tier 1 Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Risk Weighted Assets) |  | 137,137 | 124,189
Total Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Risk Weighted Assets) |  | $ 171,421 | $ 155,236
Tier 1 Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Average Assets), Ratio |  | 5.00% | 5.00%
Common Equity Tier 1 Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Risk Weighted Assets), ratio |  | 6.50% | 6.50%
Tier 1 Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Risk Weighted Assets), Ratio |  | 8.00% | 8.00%
Total Capital to be Well-Capitalized Under Prompt Corrective Action Provision (To Risk Weighted Assets), Ratio |  | 10.00% | 10.00%
[1] | The minimum amounts and ratios as of December 31, 2019 include the fourth year phase in of the capital conservation buffer of 2.5 percent required by the Basel III framework. As of December 31, 2018, minimum amounts and ratios include the third year phase in of the capital conservation buffer of 1.875 percent required by the Basel III framework.

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