Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Exercise of stock options (shares)
Cash dividends on common stock (per share)	$ 0.16	$ 0.14
Treasury stock purchases (shares)	515	32,093
Series D Preferred Stock [Member]
Preferred stock, dividend rate	4.50%	4.50%
Series G Preferred Stock [Member]
Preferred stock, dividend rate		6.00%
Series H Preferred Stock [Member]
Preferred stock, dividend rate	3.50%	3.50%
Series I Preferred Stock [Member]
Preferred stock, dividend rate	3.00%