Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash dividends declared, per share (in USD per share)	$ 0.77	$ 0.73	$ 0.68
Treasury stock (in shares)	102,649	80,862	58,762
Common Stock
Common stock issued in acquisition (in shares)		4,933,115