Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash dividends declared
Common stock, dividend per share (in dollars per share)	$ 0.43	$ 0.43	$ 1.29	$ 1.21
Series B Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	9.98		36.44	26.00
Series C Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	$ 9.20	$ 24.50	$ 43.99	$ 49.00