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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]    
Change in fair value of equity securities $ (49) $ 66
Other income 111 644
Interest expense 3,978 7,113
Income before federal income taxes 13,058 18,995
Income tax benefit (258) (2,880)
Net income 12,800 16,115
Total other comprehensive income (loss) 9,176 394
Total Comprehensive Income 21,976 16,509
Franklin Financial Services Corporation [Member]    
Condensed Financial Statements, Captions [Line Items]    
Dividends from Bank subsidiary 6,639 8,710
Change in fair value of equity securities (50) 66
Income 6,589 8,776
Interest expense 427  
Operating expenses 1,473 1,176
Income before federal income taxes 4,689 7,600
Income tax benefit 409 867
Equity in undistributed income of subsidiaries 7,702 7,648
Net income 12,800 16,115
Total other comprehensive income (loss) 9,176 394
Total Comprehensive Income $ 21,976 $ 16,509