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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Document And Entity Information [Abstract]      
Document Type 10-K/A    
Amendment Flag true    
Document Annual Report true    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-38884    
Entity Registrant Name FRANKLIN FINANCIAL SERVICES CORPORATION    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 25-1440803    
Entity Address, Address Line One 20 South Main Street    
Entity Address, City or Town Chambersburg    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 17201-0819    
City Area Code 717    
Local Phone Number 264-6116    
Title of 12(b) Security Common stock    
Trading Symbol FRAF    
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 Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation false    
Entity Public Float     $ 127,696,088
Entity Common Stock, Shares Outstanding   4,449,969  
Documents Incorporated by Reference Portions of the definitive annual proxy statement to be filed, pursuant to Reg. 14A within 120 days after December 31, 2021, are incorporated into Part III.    
Amendment Description Franklin Financial Services Corporation is filing this Annual Report on Form 10-K/A (this “Amendment”) to correct the Form 10-K for the year ended December 31, 2021 filed on March 10, 2022 (the “Original Filing”). The Amendment is being filed to correct Table 10 Loan Performance Ratios, included in Item 7 - Management’s Discussion and Analysis of Financial Condition and Results of Operations.  Table 10 as included in the Original Filing erroneously identified certain year-end 2021 values as year-end 2020 values and vice-versa. Consequently, certain ratios for the presented years were incorrect.  This Amendment corrects this error. In addition, pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended, this Amendment includes new certifications of our principal executive officer and principal financial officer on Exhibits 31.1, 31.2 and 32.1 and 32.2, each as of the date of filing this Amendment. Except as described above, this Amendment does not modify or update disclosures presented in the Original Form 10-K to reflect events occurring after the filing of the Original Form 10-K. Accordingly, this Amendment should be read in conjunction with the Original Form 10-K and the Company’s filings with the U.S. Securities and Exchange Commission subsequent to the filing of the Original Form 10-K.    
Entity Central Index Key 0000723646    
Auditor Name Crowe LLP    
Auditor Location Cleveland, Ohio    
Auditor Firm ID 173