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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2025

Investments, Debt and Equity Securities [Abstract]

Schedule of amortized cost and fair value of securities

Fair value of equity securities with readily determinable fair values at March 31, 2025 and December 31, 2024, are as follows:

(In thousands)			Fair Value at Beginning of Period												Gains (Losses)						Fair Value at End of Period
Three Months Ended March 31, 2025
CRA Mutual Fund			$	919											$	14					$	933
Twelve Months Ended December 31, 2024
CRA Mutual Fund			928												(9)						919
			$	928											$	(9)					$	919

Amortized cost and fair value of investment securities were as follows:

(In thousands)			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value
March 31, 2025
Available for Sale
U.S. Government and agencies			$	159,443					$	—					$	13,795					$	145,648
Collateralized mortgage obligations			58,652						131						3,151						55,632
Residential mortgage-backed securities			164,592						51						17,419						147,224
Commercial mortgage-backed securities			81,013						312						4,216						77,109
Corporate bonds			31,825						47						1,666						30,206
			$	495,525					$	541					$	40,247					$	455,819
Held to Maturity
State and municipal			$	62,985					$	—					$	8,282					$	54,703
Residential mortgage-backed securities			1,569						—						53						1,516
			$	64,554					$	—					$	8,335					$	56,219
December 31, 2024
Available for Sale
U.S. Government and agencies			$	159,799					$	—					$	16,606					$	143,193
Collateralized mortgage obligations			39,540						—						3,886						35,654
Residential mortgage-backed securities			159,349						2						20,811						138,540
Commercial mortgage-backed securities			65,350						—						4,565						60,785
Corporate bonds			17,600						—						1,797						15,803
			$	441,638					$	2					$	47,665					$	393,975
Held to Maturity
State and municipal			$	62,838					$	—					$	7,586					$	55,252
Residential mortgage-backed securities			1,740						—						68						1,672
			$	64,578					$	—					$	7,654					$	56,924

Schedule of unrealized losses and fair value

The following table shows the Corporation’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at March 31, 2025, and December 31, 2024:

			Less than 12 Months												12 Months or More												Total
(In thousands)			Fair Value						Unrealized Losses						Fair Value						Unrealized Losses						Fair Value						Unrealized Losses
March 31, 2025
Available for Sale
U.S. Government and agencies			$	—					$	—					$	145,648					$	13,795					$	145,648					$	13,795
Collateralized mortgage obligations			5,702						6						35,162						3,145						40,864						3,151
Residential mortgage-backed securities			2,710						—						134,660						17,419						137,370						17,419
Commercial mortgage-backed securities			1,461						14						28,956						4,202						30,417						4,216
Corporate bonds			—						—						15,435						1,666						15,435						1,666
			$	9,873					$	20					$	359,861					$	40,227					$	369,734					$	40,247
Held to Maturity
State and municipal			$	—					$	—					$	54,703					$	8,282					$	54,703					$	8,282
Residential mortgage-backed securities			—						—						1,516						53						1,516						53
			$	—					$	—					$	56,219					$	8,335					$	56,219					$	8,335
December 31, 2024
Available for Sale
U.S. Government and agencies			$	—					$	—					$	143,193					$	16,606					$	143,193					$	16,606
Collateralized mortgage obligations			—						—						35,654						3,886						35,654						3,886
Residential mortgage-backed securities			2,692						26						135,626						20,785						138,318						20,811
Commercial mortgage-backed securities			31,860						73						28,925						4,492						60,785						4,565
Corporate bonds			—						—						15,803						1,797						15,803						1,797
			$	34,552					$	99					$	359,201					$	47,566					$	393,753					$	47,665
Held to Maturity
State and municipal			$	—					$	—					$	55,252					$	7,586					$	55,252					$	7,586
Residential mortgage-backed securities			—						—						1,672						68						1,672						68
			$	—					$	—					$	56,924					$	7,654					$	56,924					$	7,654

Schedule of amortized cost and fair value by contractual maturity

Amortized cost and fair value at March 31, 2025, by contractual maturity, where applicable, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay with or without penalties. Securities not due at a single maturity date are shown separately.

			Available for Sale												Held to Maturity
(In thousands)			Amortized Cost						Fair Value						Amortized Cost						Fair Value
1 year or less			$	18,694					$	18,413					$	—					$	—
Over 1 year through 5 years			103,172						95,682						4,185						3,755
Over 5 years through 10 years			67,402						60,213						30,375						28,491
Over 10 years			2,007						1,553						28,424						22,457
Mortgage-backed securities			304,250						279,958						1,570						1,516
			$	495,525					$	455,819					$	64,554					$	56,219

Gain (Loss) on Securities

The proceeds from sales and calls of securities and the associated gains and losses are listed below:

			Three Months Ended March 31,
(In thousands)			2025						2024
Proceeds from sales			$	97,883					$	14,336
Proceeds from calls			500						1,984
Gross gains			—						87
Gross losses			—						18

ACNB received $97.7 million in proceeds from the sale of Traditions’ investments subsequent to the Acquisition date.

X

- Definition

Tabular disclosure of realized and unrealized gain (loss) on investment in security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

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For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-6

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