CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash dividends per share common stock (in dollars per share)	$ 0.13	$ 0.11
Shares of common stock purchased (in shares)	1,761	3,338
Shares of common stock issued (in shares)	1,116,644	557,530
Series D Preferred Stock
Cash dividends per share preferred stock (in dollars per share)	$ 17.50	$ 17.50