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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Exercise of stock options (shares)	31,000				67,623	500
Cash dividends on common stock (per share)	$ 0.16	$ 0.14	$ 0.14	$ 0.14		$ 0.14
Treasury stock purchases (shares)	91,491				189,366	500,000
Cashless Stock Options Exercise [Member]
Exercise of stock options (shares)					31,000
Series C Preferred Stock [Member]
Preferred stock, dividend rate				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%
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%		3.50%

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

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