Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Preferred Series E [Member]
Preferred stock per share dividend amount	$ 16.125	$ 16.125	$ 32.25	$ 32.25
Preferred Series F [Member]
Preferred stock per share dividend amount	128.125	128.125	256.25	256.25
Preferred Series G [Member]
Preferred stock per share dividend amount	125.00	125.00	250.00	250.694
Retained Earnings [Member]
Common stock per share dividend amount	$ 1.10	$ 1.10	$ 2.20	$ 2.20