Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Stock option exercise/stock unit conversions (513,824 shares during 2021 and 66,215 shares during 2020)	513,824	66,215
Redemption of series A preferred stock (6,000,000 shares)		6,000,000
Purchase of treasury stock (11,625 shares during 2021 and 181,825 shares during 2020)	11,625	181,825
Treasury stock issued to the 401(k) stock purchase plan (18,555 shares)	18,555
Cash dividend - preferred stock (Approximately $14.34 per share during 2021 and $0.34 per share during 2020)	$ 14.34	$ 0.34
Cash dividend - Preferred Stock Dividends equivalent Per depositary Share Declared ($0.36 during 2021)	0.36
Cash dividends - common stock ($0.72 per share during 2021 and $0.71 per share during 2020)	$ 0.72	$ 0.71