Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash dividends declared
Common stock, dividend per share (in dollars per share)	$ 0.43	$ 0.39	$ 1.21	$ 1.09
Series B Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)			26.00	26.00
Series C Preferred Stock [Member]
Cash dividends declared
Preferred stock, dividend per share (in dollars per share)	$ 24.50	$ 24.50	$ 49.00	$ 49.00