Parent Company (Franklin Financial Services Corporation) Financial Information (Schedule Of Condensed Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Financial Statements, Captions [Line Items]
OTTI losses recognized in earnings									$ (20)	$ (75)	$ (100)
Securities gains (losses), net	59	(20)	221		4	(25)	(21)		280	33	44
Income before federal income tax expense	2,194	3,051	2,925	2,238	1,347	2,768	1,553	1,859	10,408	7,527	5,877
Federal income tax expense	347	641	606	412	206	583	198	308	2,006	1,295	512
Net income	1,847	2,410	2,319	1,826	1,141	2,185	1,355	1,551	8,402	6,232	5,365
Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from Bank subsidiary									1,151	2,529	2,680
Interest and dividend subsidiary									15	31	29
OTTI losses recognized in earnings										(50)
Securities gains (losses), net									82	30	(1)
Investment Income, Nonoperating, Total									1,248	2,540	2,708
Operating Expenses									795	752	734
Income before federal income tax expense									453	1,788	1,974
Federal income tax expense									(241)	(259)	(249)
Equity in undistributed income of subsidiaries									(7,708)	(4,185)	(3,142)
Net income									$ 8,402	$ 6,232	$ 5,365