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Cover Page - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 02, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 0-17077    
Entity Registrant Name PENNS WOODS BANCORP, INC.    
Entity Incorporation, State or Country Code PA    
Entity Address, Address Line One 300 Market Street, P.O. Box 967    
Entity Tax Identification Number 23-2226454    
Entity Address, City or Town Williamsport,    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 17703-0967    
City Area Code 570    
Local Phone Number 322-1111    
Title of 12(b) Security Common stock, $5.55 par value    
Trading Symbol PWOD    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Smaller Reporting Company true    
Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 212,346,847
Entity Common Stock, Shares Outstanding   7,040,966  
Entity Central Index Key 0000716605    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY