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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

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