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Consolidated Statements of Changes in Shareholders' Equity - Unaudited (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Special dividend (shares)			0.15389
Series C Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	$ 0.346206	$ 0.357778	$ 1.041346	$ 1.232778
Series D Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	0.332790	0.40625	1.075982	1.21875
Series E Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	0.335984	0.403125	1.142234	1.209375
Series F Preferred Stock
Preferred stock, dividends, per share, cash paid (usd per share)	$ 0.375	$ 0.375	$ 1.125	$ 1.125

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