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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]    
Other income $ 1,436 $ 131
Income before federal income tax expense 18,995 5,960
Income tax benefit (2,880) 165
Net income 16,115 6,125
Franklin Financial Services Corporation [Member]    
Condensed Financial Statements, Captions [Line Items]    
Dividends from Bank subsidiary 8,710 3,259
Other income 66 9
Income 8,776 3,268
Operating expenses 1,176 1,184
Income before federal income tax expense 7,600 2,084
Income tax benefit 867 207
Equity in undistributed income of subsidiaries 7,648 3,834
Net income $ 16,115 $ 6,125