Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Changes in Shareholders' Equity [Abstract]
Common shares issued			3,365,853
Restricted stock award grants shares	26,900	17,900	16,500
Forfeiture of restricted stock award grants shares		1,488	1,343
Exercise of stock options shares including tax benefit	31,875	28,750	8,206
Reissue of treasury stock shares	39,811	94,895	86,772
Cash dividends declared per share	$ 0.66	$ 0.66	$ 0.66