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Investment Securities
 6 Months Ended
Jun. 30, 2025
Securities Financing Transactions Disclosures [Abstract]  
Investment Securities Investment Securities
AFS Securities
At June 30, 2025, the fair value of AFS securities totaled $404.7 million. At June 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 June 30, 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
At June 30, 2025, Mid Penn’s HTM securities totaled $364.0 million. The Company 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 June 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 June 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 June 30, 2025. Therefore, no allowance for credit losses was recorded as of June 30, 2025.
Accrued interest receivable is excluded from the estimate of credit losses for HTM securities. At June 30, 2025, accrued interest receivable totaled $1.6 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:
June 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$17,800 $— $419 $17,381 
Mortgage-backed U.S. government agencies357,124 1,571 14,650 344,045 
State and political subdivision obligations4,337 — 670 3,667 
Corporate debt securities42,028 127 2,503 39,652 
Total available-for-sale debt securities421,289 1,698 18,242 404,745 
Held-to-maturity
U.S. Treasury and U.S. government agencies$233,510 $— $20,675 $212,835 
Mortgage-backed U.S. government agencies34,908 1 4,383 30,526 
State and political subdivision obligations73,165 2 5,859 67,308 
Corporate debt securities22,446 — 1,317 21,129 
Total held-to-maturity debt securities364,029 3 32,234 331,798 
Total$785,318 $1,701 $50,476 $736,543 
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 $490.7 million at June 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 $158.6 million as of June 30, 2025 and $156.0 million as of December 31, 2024.
The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented:
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
June 30, 2025Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale debt securities:
U.S. Treasury and U.S. government agencies—$— $— 10$17,381 $419 10$17,381 $419 
Mortgage-backed U.S. government agencies23225,167 1,019 89118,878 13,631 112344,045 14,650 
State and political subdivision obligations136 — 83,631 670 93,667 670 
Corporate debt securities410,319 — 1729,333 2,503 2139,652 2,503 
Total available-for-sale debt securities28$235,522 $1,019 124$169,223 $17,223 152$404,745 $18,242 
Held-to-maturity debt securities:
U.S. Treasury and U.S. government agencies—— — 138212,835 20,675 138212,835 20,675 
Mortgage-backed U.S. government agencies3282 — 6130,244 4,383 6430,526 4,383 
State and political subdivision obligations83,185 15 15864,123 5,844 16667,308 5,859 
Corporate debt securities48,488 8 1012,641 1,309 1421,129 1,317 
Total held-to-maturity debt securities1511,955 23 367319,843 32,211 382331,798 32,234 
Total43$247,477 $1,042 491$489,066 $49,434 534$736,543 $50,476 
(Dollars in thousands)Less Than 12 Months12 Months or MoreTotal
December 31, 2024Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses		Number
of
Securities		Estimated
Fair
Value		Gross
Unrealized
Losses
Available-for-sale securities:
U.S. Treasury and U.S. government agencies—$— $— 12$21,507 $740 12$21,507 $740 
Mortgage-backed U.S. government agencies972,499 1,847 91130,445 17,684 100202,944 19,531 
State and political subdivision obligations—— — 83,596 713 83,596 713 
Corporate debt securities—— — 1832,430 3,320 1832,430 3,320 
Total available-for-sale securities972,499 1,847 129187,978 22,457 138260,477 24,304 
Held-to-maturity securities:
U.S. Treasury and U.S. government agencies—$— $— 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 June 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 June 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 six months ended June 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
June 30, 2025Amortized
Cost		Fair
Value		Amortized
Cost		Fair
Value
Due in 1 year or less$7,000 $6,942 $23,502 $23,262 
Due after 1 year but within 5 years21,450 20,989 146,772 138,790 
Due after 5 years but within 10 years34,871 32,140 145,251 128,203 
Due after 10 years844 629 13,596 11,017 
64,165 60,700 329,121 301,272 
Mortgage-backed securities357,124 344,045 34,908 30,526 
$421,289 $404,745 $364,029 $331,798