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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2025
Business Combination [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill, which has an indefinite useful life, is evaluated for impairment annually or more frequently if events and circumstances indicate that the asset might be impaired. The Corporation did not identify any goodwill impairment on the Bank or ACNB Insurance Services from its most recent testing performed as of November 30, 2024. There were no impairment losses or accumulated impairment losses associated with goodwill as of September 30, 2025 and December 31, 2024.
The following table presents goodwill as of the periods presented:
(In thousands)September 30, 2025December 31, 2024
Balance, beginning of year$44,185 $44,185 
Acquired goodwill20,264 — 
Balance, end of period$64,449 $44,185 
The following table presents intangible assets, net of accumulated amortization, for the periods shown below:
Three Months Ended September 30,Nine Months Ended September 30,
(In thousands)2025202420252024
Beginning of period$24,694 $8,446 $7,838 $9,082 
Acquired core deposit intangible— — 18,854 — 
Amortization expense(1,129)(304)(3,127)(940)
Balance, end of period$23,565 $8,142 $23,565 $8,142 
The following table shows the amortization expense of the intangible assets for future periods:
Year (In thousands)
Remainder of 2025$1,130 
20264,117 
20273,628 
20283,139 
20292,732 
Thereafter8,819 
$23,565