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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended				12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2021		Dec. 31, 2020
Exercise of stock options (shares)					70,723	[1]	500
Exercise of stock options (shares)					39,291
Cash dividends on common stock (per share)	$ 0.16	$ 0.16	$ 0.14	$ 0.14			$ 0.56
Treasury stock purchases (shares)					301,024		500,000
Series C Preferred Stock [Member]
Preferred stock, dividend rate							6.00%
Series D Preferred Stock [Member]
Preferred stock, dividend rate					4.50%		4.50%
Series F Preferred Stock [Member]
Preferred stock, dividend rate							6.00%
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%
Series I Preferred Stock [Member]
Preferred stock, dividend rate					3.00%
[1] Includes 31,432 cashless exercise of options.

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