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Cover
Jul. 20, 2021
Aug. 10, 2020
Cover [Abstract]    
Document Type 8-K  
Document Period End Date Jul. 20, 2021  
Entity Registrant Name   ORRSTOWN FINANCIAL SERVICES, INC.
Entity Incorporation, State or Country Code   PA
Entity File Number   001-34292
Entity Tax Identification Number   23-2530374
Entity Address, Address Line One   77 East King Street,
Entity Address, Address Line Two   P. O. Box 250
Entity Address, City or Town   Shippensburg,
Entity Address, State or Province   PA
Entity Address, Postal Zip Code   17257
City Area Code   (717)
Local Phone Number   532-6114
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Entity Emerging Growth Company   false
Title of 12(b) Security   Common Stock, no par value
Trading Symbol   ORRF
Security Exchange Name   NASDAQ
Entity Central Index Key 0000826154  
Amendment Flag false