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Parent Company (Franklin Financial Services Corporation) Financial Information (Statements Of Comprehensive 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]
Net income		$ 3,804	$ 4,000	$ (5,181)	$ 3,502	$ (7,263)	$ 3,076	$ 3,342	$ 3,020	$ 6,125	$ 2,176	$ 8,087
Securities:
Unrealized gains arising during the period	[1]									(998)	177	(1,176)
Reclassification adjustment for net (gains) losses included in net income	[1]									(56)	(3)	18
Net unrealized (losses) gains	[1]									(1,054)	174	(1,158)
Tax effect	[1]									264	(60)	394
Net of tax amount	[1]									(790)	114	(764)
Total other comprehensive (loss) income										(151)	(821)	(493)
Franklin Financial Services Corporation [Member]
Condensed Financial Statements, Captions [Line Items]
Net income										6,125	2,176	8,087
Securities:
Unrealized gains arising during the period											201
Reclassification adjustment for net (gains) losses included in net income
Net unrealized (losses) gains											201
Tax effect											(68)
Net of tax amount											133
Total other comprehensive (loss) income											133
Other comprehensive (loss) income of subsidiaries										(151)	(954)	(493)
Total Comprehensive Income										$ 5,974	$ 1,355	$ 7,594
[1] Securities / securities (gains) losses and OTTI losses, net $12, $1, and $(6) for years ended December 31, 2018, 2017, and 2016, respectively.

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