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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Comprehensive 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] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 3,804 | $ 4,000 | $ (5,181) | $ 3,502 | $ (7,263) | $ 3,076 | $ 3,342 | $ 3,020 | $ 6,125 | $ 2,176 | $ 8,087
Securities: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains arising during the period | [1] |  |  |  |  |  |  |  |  | (998) | 177 | (1,176)
Reclassification adjustment for net (gains) losses included in net income | [1] |  |  |  |  |  |  |  |  | (56) | (3) | 18
Net unrealized (losses) gains | [1] |  |  |  |  |  |  |  |  | (1,054) | 174 | (1,158)
Tax effect | [1] |  |  |  |  |  |  |  |  | 264 | (60) | 394
Net of tax amount | [1] |  |  |  |  |  |  |  |  | (790) | 114 | (764)
Total other comprehensive (loss) income |  |  |  |  |  |  |  |  |  | (151) | (821) | (493)
Franklin Financial Services Corporation [Member] |  |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 6,125 | 2,176 | 8,087
Securities: |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains arising during the period |  |  |  |  |  |  |  |  |  |  | 201 |
Reclassification adjustment for net (gains) losses included in net income |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized (losses) gains |  |  |  |  |  |  |  |  |  |  | 201 |
Tax effect |  |  |  |  |  |  |  |  |  |  | (68) |
Net of tax amount |  |  |  |  |  |  |  |  |  |  | 133 |
Total other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  | 133 |
Other comprehensive (loss) income of subsidiaries |  |  |  |  |  |  |  |  |  | (151) | (954) | (493)
Total Comprehensive Income |  |  |  |  |  |  |  |  |  | $ 5,974 | $ 1,355 | $ 7,594
[1] | Securities / securities (gains) losses and OTTI losses, net $12, $1, and $(6) for years ended December 31, 2018, 2017, and 2016, respectively.

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