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Parent Company (Franklin Financial Services Corporation) Condensed Financial Information (Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]    
Change in fair value of equity securities $ (69) $ 90
Interest expense 4,863 2,902
Income before federal income taxes 17,495 23,014
Income tax benefit (2,557) (3,398)
Net income 14,938 19,616
Total other comprehensive loss (50,740) (3,737)
Total Comprehensive (Loss) Income (35,802) 15,879
Franklin Financial Services Corporation [Member]    
Condensed Financial Statements, Captions [Line Items]    
Dividends from Bank subsidiary 5,670 4,050
Change in fair value of equity securities (69) 90
Dividends 5 9
Income 5,606 4,149
Interest expense 1,047 1,048
Operating expenses 1,771 1,536
Income before federal income taxes 2,788 1,565
Income tax benefit 600 517
Equity in undistributed income of subsidiaries 11,550 17,534
Net income 14,938 19,616
Total other comprehensive loss (50,740) (3,737)
Total Comprehensive (Loss) Income $ (35,802) $ 15,879