Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Retained Earnings
Cash dividends declared per common share (in dollars per share)	$ 0.32	$ 0.29	$ 0.96	$ 0.87