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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Exercise of stock options (shares)	7,000	500
Cash dividends on common stock (per share)	$ 0.14	$ 0.14
Treasury stock purchases (shares)	32,093	127,058
Series C Preferred Stock [Member]
Preferred stock, dividend rate		6.00%
Series D Preferred Stock [Member]
Preferred stock, dividend rate	4.50%	4.50%	4.50%
Series F Preferred Stock [Member]
Preferred stock, dividend rate		6.00%
Series G Preferred Stock [Member]
Preferred stock, dividend rate	6.00%	6.00%	6.00%
Series H Preferred Stock [Member]
Preferred stock, dividend rate	3.50%	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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