ORRSTOWN FINANCIAL SERVICES, INC. (PARENT COMPANY ONLY) CONDENSED FINANCIAL INFORMATION - Condensed Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assets
Cash in bank subsidiary	$ 51,026	$ 32,586
Other assets	79,986	38,759
Total assets	5,441,589	3,064,240
Liabilities
Subordinated notes and trust preferred debt	68,680	32,093
Other liabilities	91,904	60,992
Total liabilities	4,924,907	2,799,184
Shareholders’ Equity
Common stock	1,027	583
Additional paid-in capital	423,274	189,027
Retained earnings	126,540	117,667
Accumulated other comprehensive loss	(26,316)	(28,476)
Treasury stock	(7,843)	(13,745)
Total shareholders’ equity	516,682	265,056	$ 228,896	$ 271,656
Total liabilities and shareholders’ equity	5,441,589	3,064,240
Orrstown Financial Services, Inc.
Assets
Cash in bank subsidiary	16,595	13,996
Investment in bank subsidiary	569,254	284,540
Other assets	882	659
Total assets	586,731	299,195
Liabilities
Subordinated notes and trust preferred debt	60,990	32,093
Trust preferred debt	7,690	0
Other liabilities	1,369	2,046
Total liabilities	70,049	34,139
Shareholders’ Equity
Common stock	1,027	583
Additional paid-in capital	423,274	189,027
Retained earnings	126,540	117,667
Accumulated other comprehensive loss	(26,316)	(28,476)
Treasury stock	(7,843)	(13,745)
Total shareholders’ equity	516,682	265,056
Total liabilities and shareholders’ equity	$ 586,731	$ 299,195