Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Preferred Series A [Member]
Preferred stock per share dividend amount	$ 15.9375	$ 15.9375	$ 31.875	$ 31.875
Preferred Series C [Member]
Preferred stock per share dividend amount	15.9375	15.9375	31.875	31.875
Preferred Series E [Member]
Preferred stock per share dividend amount	16.125	16.125	32.25	32.25
Series F Preferred Stock [Member]
Preferred stock per share dividend amount	128.125	128.125	256.25	256.25
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.00	$ 0.80	$ 2.00	$ 1.55
Treasury Stock [Member] | Series A Warrants [Member]
Exercise of warrants into shares of common stock		17,252		54,226
Exercise of warrants into shares of common stock		10,115		32,668