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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023
Exercise of stock options (shares)			111,750		61,000	111,950
Treasury stock purchases (shares)			116,626		266,753	71,513
Cash dividends on common stock (per share)	$ 0.16	$ 0.16	$ 0.16	$ 0.48	$ 0.48	$ 0.48
Series D Preferred Stock [Member]
Preferred stock, dividend rate						4.50%
Series G Preferred Stock [Member]
Preferred stock, dividend rate			3.00%			6.00%
Series H Preferred Stock [Member]
Preferred stock, dividend rate		3.50%	3.50%		3.50%	3.50%
Series I Preferred Stock [Member]
Preferred stock, dividend rate	3.00%	3.00%		3.00%	3.00%	3.00%	3.00%
Series J Preferred Stock [Member]
Preferred stock, dividend rate	8.00%			8.00%			8.00%

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Stock Issued During Period, Shares, Stock Option Exercised, Excluding Cashless Exercises

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