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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  | $ 131 | $ 221 | $ 246
Income before federal income tax expense | $ 4,310 |  | $ 4,654 | $ (6,997) | $ 3,993 | $ (6,215) |  | $ 3,850 | $ 4,292 | $ 3,813 | 5,960 | 5,741 | 9,389
Income tax benefit | (506) | [1] | (654) | 1,816 | (491) | (1,048) | [1] | (774) | (950) | (793) | 165 | (3,565) | (1,302)
Net income | $ 3,804 |  | $ 4,000 | $ (5,181) | $ 3,502 | $ (7,263) |  | $ 3,076 | $ 3,342 | $ 3,020 | 6,125 | 2,176 | 8,087
Franklin Financial Services Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends from Bank subsidiary |  |  |  |  |  |  |  |  |  |  | 3,259 | 3,225 | 4,006
Other income |  |  |  |  |  |  |  |  |  |  | 9 |  |
Income |  |  |  |  |  |  |  |  |  |  | 3,268 | 3,225 | 4,006
Operating expenses |  |  |  |  |  |  |  |  |  |  | 1,184 | 1,107 | 972
Income before federal income tax expense |  |  |  |  |  |  |  |  |  |  | 2,084 | 2,118 | 3,034
Income tax benefit |  |  |  |  |  |  |  |  |  |  | 207 | 348 | 301
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  |  |  | 3,834 | (290) | 4,752
Net income |  |  |  |  |  |  |  |  |  |  | $ 6,125 | $ 2,176 | $ 8,087
[1] | Includes $2.3 million for revaluation of the net deferred tax assets

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