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Parent Company (Franklin Financial Services Corporation) Condensed Financial Information (Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Cash and cash equivalents $ 23,140 $ 64,899  
Other assets 13,421 12,672  
Total assets 1,836,039 1,699,579  
Other Liabilities 11,448 8,167  
Total liabilities 1,703,903 1,585,382  
Shareholders' equity 132,136 114,197 $ 157,065
Total liabilities and shareholders' equity 1,836,039 1,699,579  
Franklin Financial Services Corporation [Member]      
Condensed Financial Statements, Captions [Line Items]      
Cash and cash equivalents 10,070 13,500 $ 17,637
Investment securities 427 411  
Equity investment in subsidiaries 140,074 118,768  
Other assets 1,228 1,153  
Total assets 151,799 133,832  
Subordinated notes 19,661 19,623  
Other Liabilities 2 12  
Total liabilities 19,663 19,635  
Shareholders' equity 132,136 114,197  
Total liabilities and shareholders' equity $ 151,799 $ 133,832