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Borrowings | 9 Months Ended
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Sep. 30, 2025
Debt Disclosure [Abstract] |
Borrowings | Borrowings Short-term borrowings and weighted-average interest rates for the periods presented:
| September 30, 2025 |  | December 31, 2024
(Dollars in thousands) | Amount |  | Rate |  | Amount |  | Rate
Securities sold under repurchase agreements | $ | 27,127 |  |  | 0.19 | % |  | $ | 15,826 |  |  | 0.23 | %
FHLB advances | 50,000 |  |  | 4.49 |  |  | — |  |  | — |
Federal funds purchased | 3,341 |  |  | 4.09 |  |  | — |  |  | — |
| $ | 80,468 |  |  | 3.02 | % |  | $ | 15,826 |  |  | 0.23 | %
Borrowings with original maturities of one year or less are classified as short-term. Securities sold under repurchase agreements are comprised of customer repurchase agreements, which are sweep accounts with next-day maturities utilized by larger commercial customers to earn interest on their funds. Securities are pledged to these customers in an amount at least equal to the outstanding balance. Under an agreement with the FHLB, the Bank has short-term borrowing capacity included within its maximum borrowing capacity. All FHLB advances are collateralized by a security agreement covering qualifying loans. In addition, all FHLB advances are secured by the FHLB capital stock owned by the Bank having a par value of $14.2 million at September 30, 2025. Long-term borrowings and their weighted-average contractual rates were comprised of the following for the periods presented:
| September 30, 2025 |  | December 31, 2024
(Dollars in thousands) | Amount |  | Rate |  | Amount |  | Rate
FHLB fixed-rate advances maturing: |  |  |  |  |  |  |
2026 | $ | 80,000 |  |  | 4.71 | % |  | $ | 80,000 |  |  | 4.71 | %
2027 | 90,000 |  |  | 4.55 |  |  | 90,000 |  |  | 4.55 |
2028 | 35,000 |  |  | 4.23 |  |  | 35,000 |  |  | 4.23 |
2029 | 30,000 |  |  | 4.25 |  |  | 30,000 |  |  | 4.25 |
Trust preferred subordinated debt 1 | 5,365 |  |  | 6.20 |  |  | 5,333 |  |  | 6.25 |
Subordinated debt | 15,000 |  |  | 4.00 |  |  | 15,000 |  |  | 4.00 |
| $ | 255,365 |  |  | 4.52 | % |  | $ | 255,333 |  |  | 4.52 | %
________________________________________ 1 Net of purchase accounting fair value mark. The long-term FHLB advances have a weighted average rate of 4.52%, and are collateralized by the assets defined in the security agreement and FHLB capital stock described previously. Based on this collateral and ACNB’s holding of FHLB stock, ACNB is eligible to borrow up to $1.29 billion, of which $1.01 billion was available at September 30, 2025. The trust preferred subordinated debt is comprised of debt securities issued by FCBI in December 2006 and assumed by ACNB Corporation through the acquisition of FCBI. FCBI completed the private placement of an aggregate of $6.0 million of trust preferred securities. The interest rate on the subordinated debentures is adjusted quarterly to 163 bps over the three-month CME Term SOFR plus applicable tenor spread adjustment. On September 15, 2025, the most recent interest rate reset date, the interest rate was adjusted to 5.93% through the period ending December 14, 2025. The trust preferred securities mature on December 15, 2036, and may be redeemed at par, at the Corporation’s option, on any interest payment date. The trust preferred subordinated debt is considered Tier 1 capital for the consolidated capital ratios. On March 30, 2021, the Company entered into Purchase Agreements with the Purchasers pursuant to which the Company sold and issued $15.0 million in aggregate principal amount of its 4.00% fixed-to-floating rate subordinated notes due March 31, 2031. The Subordinated Notes bear interest at a fixed rate of 4.00% per year, from and including March 30, 2021 to, but excluding, March 31, 2026 or earlier redemption date. From and including March 31, 2026 to, but excluding the maturity date or earlier redemption date, the interest rate will reset quarterly at a variable rate equal to the then current 90-day average SOFR plus 329 bps. As provided in the Subordinated Notes, the interest rate on the Subordinated Notes during the applicable floating rate period may be determined based on a rate other than the 90-day average SOFR. The Subordinated Notes were issued by the Corporation to the Purchasers at a price equal to 100% of their face amount. The Subordinated Notes have a stated maturity of March 31, 2031, are redeemable by the Company at its option, in whole or in part, on or after March 30, 2026, and at any time upon the occurrences of certain events. The Subordinated Notes are considered Tier 2 capital for the consolidated capital ratios.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A Reference 2: http://www.xbrl.org/2003/role/disclosureRef 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