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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Exercise of stock options (shares)			500
Treasury stock purchases (shares)			500,000
Cash dividends on common stock (per share)	$ 0.14	$ 0.14	$ 0.14	$ 0.14
Series C Preferred Stock [Member]
Preferred stock, dividend rate	6.00%	6.00%	6.00%	6.00%	6.00%
Series D Preferred Stock [Member]
Preferred stock, dividend rate	4.50%	4.50%	4.50%	4.50%	4.50%
Series F Preferred Stock [Member]
Preferred stock, dividend rate	6.00%	6.00%	6.00%	6.00%	6.00%
Series G Preferred Stock [Member]
Preferred stock, dividend rate	6.00%	6.00%	6.00%	6.00%	6.00%
Series H Preferred Stock [Member]
Preferred stock, dividend rate	3.50%		3.50%

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Aggregate dividends paid during the period for each share of common stock outstanding.

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