ORRSTOWN FINANCIAL SERVICES, INC. (PARENT COMPANY ONLY) CONDENSED FINANCIAL INFORMATION - Condensed Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income
Other income	$ 1,304	$ 1,508	$ 1,814
Expenses
Interest expense on subordinated notes	4,285	2,017	2,013
Total interest expense	93,679	44,991	9,024
Share-based compensation	8,719	2,356	2,154
Merger-related expenses	22,671	1,059	0
Provision for legal settlement	478	0	13,000
Income tax benefit	5,756	9,370	4,579
Net income	22,050	35,663	22,037
Orrstown Financial Services, Inc.
Income
Dividends from bank subsidiary	15,000	14,000	27,000
Interest income from bank subsidiary	150	158	29
Other income	105	21	16
Total income	15,255	14,179	27,045
Expenses
Interest expense on subordinated notes	3,798	2,017	2,013
Interest expense on trust preferred debt	487	0	0
Total interest expense	4,285	2,017	2,013
Share-based compensation	887	484	511
Management fee to bank subsidiary	1,606	1,449	1,341
Merger-related expenses	3,371	851	0
Provision for legal settlement	0	0	13,000
Other expenses	568	638	912
Total expenses	10,717	5,439	17,777
Income before income tax benefit and equity in undistributed income of subsidiaries	4,538	8,740	9,268
Income tax benefit	(2,198)	(1,106)	(3,726)
Income before equity in undistributed income of subsidiaries	6,736	9,846	12,994
Equity in undistributed income of subsidiaries	15,314	25,817	9,043
Net income	$ 22,050	$ 35,663	$ 22,037