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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2025
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] |
Shareholders' Equity | Shareholders' Equity Accumulated Other Comprehensive Loss (Income) The components of accumulated other comprehensive loss (income), net of taxes, are as follows:
(I n thousands) | Unrealized Loss on Securities |  | Unrealized Holding Losses on Interest Rate Derivatives used in Cash Flow Hedges |  | Defined Benefit Plans |  | Total
Balance as of December 31, 2022 | $ | (19,327) |  |  | $ | — |  |  | $ | 111 |  |  | $ | (19,216) |
OCI before reclassifications | 1,988 |  |  | 820 |  |  | (212) |  |  | 2,596 |
Amounts reclassified from AOCI | — |  |  | — |  |  | (17) |  |  | (17) |
Balance - December 31, 2023 | (17,339) |  |  | 820 |  |  | (118) |  |  | (16,637) |
OCI before reclassifications | (1,550) |  |  | 665 |  |  | 723 |  |  | (162) |
Amounts reclassified from AOCI | — |  |  | — |  |  | (26) |  |  | (26) |
Balance - December 31, 2024 | (18,889) |  |  | 1,485 |  |  | 579 |  |  | (16,825) |
OCI before reclassifications | 11,918 |  |  | (1,676) |  |  | 308 |  |  | 10,550 |
Amounts reclassified from AOCI | — |  |  | — |  |  | (48) |  |  | (48) |
Balance - December 31, 2025 | $ | (6,971) |  |  | $ | (191) |  |  | $ | 839 |  |  | $ | (6,323) |
Treasury Stock Repurchase Program Mid Penn adopted a treasury stock repurchase program ("Program") initially effective March 19, 2020, and renewed through April 24, 2026 by Mid Penn’s Board of Directors on April 23, 2025. The Program authorizes the repurchase of up to $15.0 million of Mid Penn’s outstanding common stock. Under the Program, Mid Penn conducts repurchases of its common stock through open market transactions (which may be by means of a trading plan adopted under SEC Rule 10b5-1) or in privately negotiated transactions. Repurchases under the Program are made at the discretion of management and are subject to market conditions and other factors. There is no guarantee as to the exact number of shares that Mid Penn may repurchase. The Program is able to be modified, suspended or terminated at any time, at Mid Penn’s discretion, based upon a number of factors, including liquidity, market conditions, the availability of alternative investment opportunities and other factors Mid Penn deems appropriate. The Program does not obligate Mid Penn to repurchase any shares. Mid Penn repurchased 79,169 shares during 2025 at an average price per share of $28.50 under its share repurchase program. As of December 31, 2025, Mid Penn had repurchased an aggregate total of 519,891 shares of common stock at an average price of $23.65 per share under the Program. The Program had $2.7 million remaining available for repurchase as of December 31, 2025. Dividend Reinvestment Plan The amended and restated Dividend Reinvestment Plan of Mid Penn Bancorp, Inc. allows holders of the Corporation's common shares to purchase additional shares of the Corporation's common stock, par value $1.00 per share. Under the plan, participants may have cash dividends on all of their shares automatically reinvested, and each participating shareholder may also make optional cash contributions to purchase additional shares. As of December 31, 2025, participants in the plan held 485,896 shares of the Corporation's common stock.

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