Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.60	$ 0.57
Treasury stock issued for restricted awards, net of forfeitures (in shares)	90,115	110,643
Forfeitures of restricted stock (in shares)	23,946	5,717