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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