Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 3.13	$ 3.13
Common stock, authorized (in shares)	8,000,000	8,000,000
Common stock, issued (in shares)	3,695,160	3,669,758
Common stock, outstanding (in shares)	3,695,160	3,669,758
Common stock, nonvested (in shares)	31,423	32,572