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Restricted Common Stock	3 Months Ended
	Mar. 31, 2018
Common Stock Number Of Shares Par Value And Other Disclosures [Abstract]
Restricted Common Stock	(10) Restricted Common Stock On May 6, 2014, Mid Penn shareholders approved the 2014 Restricted Stock Plan (the “Plan”), which authorizes the issuance of awards that shall not exceed, in the aggregate, 100,000 shares of common stock.  Awards under the Plan are limited to employees and directors of the Company and the Bank selected by the Compensation Committee of the Board of Directors, to advance the best interest of Mid Penn and its shareholders.   Share-based compensation expense relating to restricted stock is recognized on a straight-line basis over the vesting periods of the awards and is a component of salaries and benefits expense.  As of March 31, 2018, a total of 26,485 restricted shares were granted under the Plan, with 6,986 of the granted shares being vested, while the remaining 19,499 granted shares remain unvested.  The Plan grants and vestings resulted in $58,000 in compensation expense for the three months ended March 31, 2018, while $19,000 of expense was recorded for the three months ended March 31, 2017.

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