CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 0.40	$ 0.38
Exercise of stock options and related tax benefit, shares	20,515	15,567
Shares issued for dividend reinvestment plan, shares	27,038	23,532
Shares issued for employee stock ownership plan, shares	31,192	17,290
Directors deferred compensation plan, shares	1,528	1,444
Shares issued related to restricted stock awards, shares	1,165	173