Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity, Class of Treasury Stock [Line Items]
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1
Repurchase plan period, in years	1 year
Shares held at cost	383,440	388,234
Common stock shares authorized	15,000,000	15,000,000
Common stock issued under dividend reinvestment plan, shares	52,755	45,864	57,320
Common stock issued under dividend reinvestment plan	$ 1,246	$ 923	$ 926
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	52,755
Common stock issued under dividend reinvestment plan	$ 1,200
Dividend Reinvestment plan shares remain to be issues	639,585
Franklin Financial Service Corporation [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock issued under dividend reinvestment plan	$ 1,246	$ 923	$ 926