Consolidted Statements of Changes in Shareholders Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 0.76	$ 0.72
Exercise of stock options and related tax benefit, shares	38,742	45,853
Shares issued for dividend reinvestment plan, shares	47,019	23,168
Shares issued for employee stock ownership plan, shares	17,290	25,655
Directors deferred compensation plan, shares	1,001	483
Common stock issued, shares		1,006,250
Net shares issued related to restricted stock awards, shares	106,325
Forfeiture of restricted shares	619	692