Shareholders' Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Equity, Class of Treasury Stock [Line Items]
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Repurchase plan period, in years	1 year
Stock repurchase program, authorized amount	$ 350,000
Shares repurchased, shares	34,048
Shares repurchased, amount	$ 795,000
Shares held at cost	371,513	383,440
Common stock shares authorized	15,000,000	15,000,000
Common stock issued under dividend reinvestment plan, shares	25,230	52,755	45,864
Common stock issued under dividend reinvestment plan	$ 1,671,000	$ 1,246,000	$ 923,000
Dividend Reinvestment Plan (DRIP) [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock shares authorized	1,000,000
Common stock issued under dividend reinvestment plan, shares	25,230
Common stock issued under dividend reinvestment plan	$ 553,000
Dividend Reinvestment plan shares remain to be issues	614,355
Franklin Financial Service Corporation [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock issued under dividend reinvestment plan	$ 1,671,000	$ 1,246,000	$ 923,000