Consolidated Statements of Changes in Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash dividends per share common stock (in dollars per share)	$ 0.59	$ 0.51	$ 0.50
Purchase of treasury stock (in shares)	1,761	13,066	82,601
Issuance of common stock (in shares)	4,525,904	3,846,493	3,766,837
Series C Preferred Stock
Cash dividends per share preferred stock (in dollars per share)			$ 2.50
Series D Preferred Stock
Cash dividends per share preferred stock (in dollars per share)	$ 52.50	$ 70	$ 52.50