CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends (in dollars per share)	$ 0.44	$ 0.42
Net exercise of stock options and related tax benefit, shares	7,751	41,948
Common stock repurchased and returned to unissued status, shares	22,356
Shares issued for employee stock ownership plan, shares	31,435	29,554
Directors deferred compensation plan, shares	4,202	2,338
Restricted stock activity, shares	5,291	4,867
Shares issued for purchase acquisition, shares	32,553