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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Exercise of stock options (shares)			61,000
Treasury stock purchases (shares)	115,000	44,598	266,753	43,113
Cash dividends on common stock (per share)	$ 0.16	$ 0.16	$ 0.32	$ 0.32
Series D Preferred Stock [Member]
Preferred stock, dividend rate		4.50%		4.50%
Series G Preferred Stock [Member]
Preferred stock, dividend rate		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%	3.00%	3.00%

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