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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |
Net income | $ 16,115 | $ 6,125
Securities: |  |
Unrealized gains arising during the period | 1,591 | (998)
Reclassification adjustment for net (gains) losses included in net income | (256) | (56)
Net unrealized gains (losses) | 1,335 | (1,054)
Tax effect | (280) | 264
Net of tax amount | 1,055 | (790)
Total other comprehensive income (loss) | 394 | (151)
Franklin Financial Services Corporation [Member] |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net income | $ 16,115 | $ 6,125

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