Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Series D Preferred Stock
Dividends declared on preferred stock during the year but paid after year-end (in dollars per share)	$ 1.58	$ 1.58	$ 0.79
Series E Preferred Stock
Dividends declared on preferred stock during the year but paid after year-end (in dollars per share)	$ 1.47	$ 0.73
Series C Preferred Stock
Dividends declared on preferred stock during the year but paid after year-end (in dollars per share)			$ 1.48