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Investment Securities
 9 Months Ended
Sep. 30, 2025
Securities Financing Transactions Disclosures [Abstract]  
Investment Securities Investment Securities
AFS Securities
At September 30, 2025, the fair value of AFS securities totaled $427.4 million. At September 30, 2025, no securities were identified that violated credit loss triggers; therefore, no DCF analysis was performed, and no credit loss was recognized on any of the securities available for sale.
Accrued interest receivable is excluded from the estimate of credit losses for AFS securities. At September 30, 2025, accrued interest receivable totaled $2.0 million for AFS securities, and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet.
HTM Securities
At September 30, 2025, Mid Penn’s HTM securities totaled $354.1 million. The Corporation primarily held highly rated HTM securities, including taxable and tax-exempt securities issued mainly by the U.S government, state governments, and political subdivisions. As of September 30, 2025, the majority of Mid Penn's HTM securities were rated as A1/BBB by Moody's and/or Standard & Poor's ratings services. Credit ratings of HTM securities, which are a key factor in estimating expected credit losses, are reviewed on a quarterly basis.
At September 30, 2025, Mid Penn had no HTM securities that were past due 30 days or more as to principal or interest payments. Mid Penn had no HTM securities classified as nonaccrual at September 30, 2025. Therefore, no allowance for credit losses was recorded as of September 30, 2025.
Accrued interest receivable is excluded from the estimate of credit losses for HTM securities. At September 30, 2025, accrued interest receivable totaled $2.0 million for HTM securities and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet.
The following tables set forth the amortized cost and estimated fair value of investment securities for the periods presented:
September 30, 2025
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Estimated
Fair Value
Available-for-sale
U.S. Treasury and U.S. government agencies$20,420 $— $478 $19,942 
Mortgage-backed U.S. government agencies375,088 3,200 12,665 365,623 
State and political subdivision obligations4,334 — 556 3,778 
Corporate debt securities40,011 211 2,213 38,009 
Total available-for-sale debt securities$439,853 $3,411 $15,912 $427,352 
Held-to-maturity
U.S. Treasury and U.S. government agencies$233,545 $— $18,568 $214,977 
Mortgage-backed U.S. government agencies33,586 1 3,990 29,597 
State and political subdivision obligations71,517 6 4,585 66,938 
Corporate debt securities15,446 — 1,352 14,094 
Total held-to-maturity debt securities354,094 7 28,495 325,606 
Total$793,947 $3,418 $44,407 $752,958 
December 31, 2024
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross Unrealized
Losses		Estimated
Fair Value
Available-for-sale
U.S. Treasury and U.S. government agencies$22,247 $— $740 $21,507 
Mortgage-backed U.S. government agencies222,464 11 19,531 202,944 
State and political subdivision obligations4,309 — 713 3,596 
Corporate debt securities35,750 — 3,320 32,430 
Total available-for-sale debt securities$284,770 $11 $24,304 $260,477 
Held-to-maturity     
U.S. Treasury and U.S. government agencies$241,941 $— $28,133 $213,808 
Mortgage-backed U.S. government agencies37,593 — 5,508 32,085 
State and political subdivision obligations77,462 — 6,840 70,622 
Corporate debt securities25,451 — 1,318 24,133 
Total held-to-maturity debt securities382,447 — 41,799 340,648 
Total$667,217 $11 $66,103 $601,125 
Estimated fair values of debt securities are based on quoted market prices, where applicable. If quoted market prices are not available, fair values are based on quoted market prices of instruments of a similar type, credit quality and structure, adjusted for differences between the quoted instruments and the instruments being valued. See "Note 8 - Fair Value Measurement," for additional information.
Investment securities having a fair value of $520.6 million at September 30, 2025 and $440.0 million at December 31, 2024 were pledged primarily to secure public deposits, some Trust department deposit accounts, and certain other borrowings. In accordance with legal provisions for alternatives other than pledging of investments, Mid Penn also obtains letters of credit from the FHLB to secure certain public deposits. These FHLB letter of credit commitments totaled $160.5 million as of September 30, 2025 and $156.0 million as of December 31, 2024.
The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented:
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
September 30, 2025Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale debt securities:
U.S. Treasury and U.S. government agencies—$— $— 11$19,942 $478 11$19,942 $478 
Mortgage-backed U.S. government agencies24208,331 99 93157,292 12,566 117365,623 12,665 
State and political subdivision obligations136 — 83,742 556 93,778 556 
Corporate debt securities513,331 53 1624,678 2,160 2138,009 2,213 
Total available-for-sale debt securities30$221,698 $152 128$205,654 $15,760 158$427,352 $15,912 
Held-to-maturity debt securities:
U.S. Treasury and U.S. government agencies—$— $— 138$214,977 $18,568 138$214,977 $18,568 
Mortgage-backed U.S. government agencies4436 — 6029,161 3,990 6429,597 3,990 
State and political subdivision obligations144,741 — 14862,197 4,585 16266,938 4,585 
Corporate debt securities33,365 131 910,729 1,221 1214,094 1,352 
Total held-to-maturity debt securities218,542 131 355317,064 28,364 376325,606 28,495 
Total51$230,240 $283 483$522,718 $44,124 534$752,958 $44,407 
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
December 31, 2024Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale securities:
U.S. Treasury and U.S. government agencies—$— $— 12$21,507 $740 12$21,507 $740 
Mortgage-backed U.S. government agencies972,499 1,847 91130,445 17,684 100202,944 19,531 
State and political subdivision obligations—— — 83,596 713 83,596 713 
Corporate debt securities—— — 1832,430 3,320 1832,430 3,320 
Total available-for-sale securities9$72,499 $1,847 $129$187,978 $22,457 138$260,477 $24,304 
Held-to-maturity securities:
U.S. Treasury and U.S. government agencies—$— $— 143$213,808 $28,133 143$213,808 $28,133 
Mortgage-backed U.S. government agencies2163 1 6231,922 5,507 6432,085 5,508 
State and political subdivision obligations83,176 30 16967,446 6,810 17770,622 6,840 
Corporate debt securities410,500 — 1113,633 1,318 1524,133 1,318 
Total held to maturity securities1413,839 31 385326,809 41,768 399340,648 41,799 
Total23$86,338 $1,878 514$514,787 $64,225 537$601,125 $66,103 
At September 30, 2025 and 2024, the majority of the unrealized losses on securities in an unrealized loss position were attributable to U.S. Treasury and U.S. government agencies, and mortgage-backed U.S. government agencies.

Mid Penn had no securities considered by management to be credit related losses as of September 30, 2025 and 2024, and did not record any securities losses in the respective periods ended on these dates. Mid Penn does not consider the securities with unrealized losses on the respective dates to be credit related losses as the unrealized losses were deemed to be temporary changes in value related to market movements in interest yields at various periods similar to the maturity dates of holdings in the investment portfolio, and not reflective of an erosion of credit quality.
There were no gross realized gains and losses on sales of available-for-sale debt securities for the nine months ended September 30, 2025 and 2024.
The table below illustrates the contractual maturity of debt investment securities at amortized cost and estimated fair value. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay with or without call or prepayment penalties.
(In thousands)Available-for-saleHeld-to-maturity
September 30, 2025Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in 1 year or less$2,000 $1,968 $21,743 $21,595 
Due after 1 year but within 5 years24,421 23,999 144,471 137,243 
Due after 5 years but within 10 years37,500 35,109 141,657 126,560 
Due after 10 years844 653 12,637 10,611 
64,765 61,729 320,508 296,009 
Mortgage-backed securities375,088 365,623 33,586 29,597 
$439,853 $427,352 $354,094 $325,606