Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cash dividends declared
Common stock, dividend per share (in dollars per share)	$ 0.39	$ 0.35	$ 0.78	$ 0.7
Series B Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	$ 26	$ 26	26	26
Series C Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)			$ 24.5	$ 24.5