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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]    
Change in fair value of equity securities $ 90 $ (49)
Interest expense 2,902 3,978
Income before federal income taxes 23,014 13,058
Income tax benefit (3,398) (258)
Net income 19,616 12,800
Total other comprehensive (loss) income (3,737) 9,176
Total Comprehensive Income 15,879 21,976
Franklin Financial Services Corporation [Member]    
Condensed Financial Statements, Captions [Line Items]    
Dividends from Bank subsidiary 4,050 6,639
Change in fair value of equity securities 90 (49)
Dividends 9  
Income 4,149 6,590
Interest expense 1,048 427
Operating expenses 1,536 1,474
Income before federal income taxes 1,565 4,689
Income tax benefit 517 409
Equity in undistributed income of subsidiaries 17,534 7,702
Net income 19,616 12,800
Total other comprehensive (loss) income (3,737) 9,176
Total Comprehensive Income $ 15,879 $ 21,976