Parent Company (Franklin Financial Services Corporation) Financial Information (Schedule Of Condensed Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	$ 36,665	$ 39,166	$ 48,593	$ 40,745
Available for sale	143,875	159,473
Other Assets	5,506	6,135
Total assets	1,127,443	1,035,295
Other Liabilities	4,560	5,407
Total liabilities	1,010,950	923,919
Shareholders' equity	116,493	111,376	103,521	95,388
Total liabilities and shareholders' equity	1,127,443	1,035,295
Franklin Financial Service Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	851	300	$ 414	$ 601
Equity investment in subsidiaries	115,794	111,535
Other Assets	39	33
Total assets	116,684	111,868
Other Liabilities	191	492
Total liabilities	191	492
Shareholders' equity	116,493	111,376
Total liabilities and shareholders' equity	$ 116,684	$ 111,868