Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Cash dividends declared
Common stock, dividend per share (in dollars per share)	$ 0.43	$ 0.39	$ 0.86	$ 0.78
Series B Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	12.37	$ 26.00	26.46	26.00
Series C Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	$ 10.29		$ 34.79	$ 24.50