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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of 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]
Other income											$ 131	$ 221	$ 246
Income before federal income tax expense	$ 4,310		$ 4,654	$ (6,997)	$ 3,993	$ (6,215)		$ 3,850	$ 4,292	$ 3,813	5,960	5,741	9,389
Income tax benefit	(506)	[1]	(654)	1,816	(491)	(1,048)	[1]	(774)	(950)	(793)	165	(3,565)	(1,302)
Net income	$ 3,804		$ 4,000	$ (5,181)	$ 3,502	$ (7,263)		$ 3,076	$ 3,342	$ 3,020	6,125	2,176	8,087
Franklin Financial Services Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Dividends from Bank subsidiary											3,259	3,225	4,006
Other income											9
Income											3,268	3,225	4,006
Operating expenses											1,184	1,107	972
Income before federal income tax expense											2,084	2,118	3,034
Income tax benefit											207	348	301
Equity in undistributed income of subsidiaries											3,834	(290)	4,752
Net income											$ 6,125	$ 2,176	$ 8,087
[1] Includes $2.3 million for revaluation of the net deferred tax assets

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