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Investment Securities
 12 Months Ended
Dec. 31, 2025
Securities Financing Transactions Disclosures [Abstract]  
Investment Securities Investment Securities
AFS Securities
As of December 31, 2025, the fair value of AFS securities totaled $416.3 million. As of December 31, 2025, no securities were identified that violated credit loss triggers; therefore, no discounted cash flow analysis was required. As of December 31, 2025, the Corporation recorded no allowance for credit losses on any available-for-sale debt securities.
Accrued interest receivable is excluded from the estimate of credit losses for AFS securities. As of December 31, 2025, accrued interest receivable totaled $1.8 million for AFS securities, and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet.
HTM Securities
As of December 31, 2025, Mid Penn’s HTM securities totaled $347.3 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 December 31, 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. Management has the intent and ability to hold these securities to maturity.
As of December 31, 2025, there were no HTM securities that were past due 30 days or more as to principal or interest payments. Additionally, Mid Penn had no HTM securities classified as nonaccrual as of December 31, 2025. As of December 31, 2025, the Corporation recorded no allowance for credit losses on any held-to-maturity debt securities.
Accrued interest receivable is excluded from the estimate of credit losses for HTM securities. As of December 31, 2025, accrued interest receivable totaled $1.5 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:
December 31, 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$19,446 $— $380 $19,066 
Mortgage-backed U.S. government agencies361,109 3,788 11,500 353,397 
State and political subdivision obligations4,319 — 485 3,834 
Corporate debt securities41,638 249 1,870 40,017 
Total available-for-sale debt securities$426,512 $4,037 $14,235 $416,314 
Held-to-maturity
U.S. Treasury and U.S. government agencies$231,980 $— $16,566 $215,414 
Mortgage-backed U.S. government agencies32,418 4 3,747 28,675 
State and political subdivision obligations67,441 12 4,043 63,410 
Corporate debt securities15,446 — 1,243 14,203 
Total held-to-maturity debt securities347,285 16 25,599 321,702 
Total$773,797 $4,053 $39,834 $738,016 
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 13 - Fair Value Measurement," for additional information.
Investment securities having a fair value of $544.7 million as of December 31, 2025, and $440.0 million as of 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 $162.5 million as of December 31, 2025 and $156.0 million as of December 31, 2024.
The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2025 and 2024:
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
December 31, 2025Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale debt securities:
U.S. Treasury and U.S. government agencies—$— $— 10$19,066 $380 10$19,066 $380 
Mortgage-backed U.S. government agencies27208,676 141 91144,721 11,359 118353,397 11,500 
State and political subdivision obligations124 — 83,810 485 93,834 485 
Corporate debt securities818,573 64 1421,444 1,806 2240,017 1,870 
Total available-for-sale debt securities36$227,273 $205 123$189,041 $14,030 159$416,314 $14,235 
Held-to-maturity debt securities:
U.S. Treasury and U.S. government agencies—$— $— 137$215,414 $16,566 137$215,414 $16,566 
Mortgage-backed U.S. government agencies4423 — 6028,252 3,747 6428,675 3,747 
State and political subdivision obligations124,401 2 13959,009 4,041 15163,410 4,043 
Corporate debt securities33,368 128 910,835 1,115 1214,203 1,243 
Total held-to-maturity debt securities198,192 130 345313,510 25,469 364321,702 25,599 
Total55$235,465 $335 468$502,551 $39,499 523$738,016 $39,834 
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
December 31, 2024Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale securities:
U.S. Treasury and U.S. government agencies—$— $— 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 
As of December 31, 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.
The Corporation evaluates debt securities for credit losses in accordance with ASC 326. Mid Penn had no securities considered by management to be credit related losses as of December 31, 2025 and December 31, 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 was $10 thousand and zero gross realized gains on the sale of AFS securities as of December 31, 2025 and December 31, 2024, respectively.
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
December 31, 2025Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in 1 year or less$3,000 $2,945 $31,445 $31,080 
Due after 1 year but within 5 years23,742 23,499 140,793 133,953 
Due after 5 years but within 10 years37,817 35,797 131,708 118,463 
Due after 10 years844 676 10,921 9,531 
65,403 62,917 314,867 293,027 
Mortgage-backed securities361,109 353,397 32,418 28,675 
$426,512 $416,314 $347,285 $321,702