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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Exercise of stock options (shares)	111,750	31,000			111,950	31,000
Treasury stock purchases (shares)	116,626	91,491			71,513	189,366
Cash dividends on common stock (per share)	$ 0.16	$ 0.16	$ 0.14	$ 0.14	$ 0.48
Series D Preferred Stock [Member]
Preferred stock, dividend rate		4.50%			4.50%	4.50%	4.50%
Series G Preferred Stock [Member]
Preferred stock, dividend rate		6.00%			6.00%	6.00%	6.00%
Series H Preferred Stock [Member]
Preferred stock, dividend rate	3.50%	3.50%			3.50%	3.50%	3.50%
Series I Preferred Stock [Member]
Preferred stock, dividend rate	3.00%				3.00%		3.00%

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