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Cover - shares
 6 Months Ended
Jun. 30, 2021
Aug. 02, 2021
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2021  
Document Transition Report false  
Entity File Number 001-34292  
Entity Registrant Name ORRSTOWN FINANCIAL SERVICES, INC.  
Entity Incorporation, State or Country Code PA  
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  
Title of 12(b) Security Common Stock, no par value  
Trading Symbol ORRF  
Securities Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   11,253,921
Entity Central Index Key 0000826154  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q2  
Amendment Flag false