Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Consolidated Balance Sheets [Abstract]
Capital stock, par value	$ 2	$ 2
Capital stock, shares authorized	10,000,000	10,000,000
Capital stock, shares issued	4,525,635	4,525,635
Prior service cost and unamortized net actuarial losses on employee benefit plans, tax	$ (174)	$ (9)
Net unrealized appreciation on securities available for sale, tax	5,547	3,845
Portion of OTTI attributable to non-credit losses, tax	$ 78	$ (218)
Treasury stock, shares	606,741	646,742