Consolidated Statement of Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Common stock dividends, share	$ 0.42	$ 0.37	$ 1.16	$ 0.97
Series A [Member]
Preferred stock dividends declared per share	894.444	894.444	2,760.506	2,654.166
Series B [Member]
Preferred stock dividends declared per share	223.61	223.61	663.54	663.54
Series F [Member]
Preferred stock dividends declared per share	406.25	406.25	1,218.75	1,218.75
Series H [Member]
Preferred stock dividends declared per share	321.88	321.88	965.64	965.64
Series J [Member]
Preferred stock dividends declared per share	662.50	662.50	1,325.00	1,325.00
Series K [Member]
Preferred stock dividends declared per share	$ 343.75	$ 232.99	1,031.25	232.99
Series I [Member]
Preferred stock dividends declared per share			$ 640.625	$ 640.625