Consolidated Statements of Changes in Equity (Unaudited) (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash dividends per share common stock (in dollars per share)	$ 0.30	$ 0.30
Shares of common stock purchased (in shares)	49,785	54,389
Shares of common stock issued (in shares)	2,295,472	2,180,585
Series C Preferred Stock
Cash dividends per share preferred stock (in dollars per share)	$ 2.50	$ 7.50
Series D Preferred Stock
Cash dividends per share preferred stock (in dollars per share)	$ 35