Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash dividends declared
Common stock, dividend per share (in dollars per share)	$ 0.43	$ 0.39
Series B Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	14.09
Series C Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	$ 24.50	$ 24.50