Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares		3 Months Ended		6 Months Ended
	Mar. 16, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Stockholders' Equity [Abstract]
Stock option exercises/stock unit conversions (shares)		77,308	53,035	143,523	153,900
Redemption of preferred stock (6,000,000 shares)	6,000,000			6,000,000
Treasury Stock, Shares, Acquired			496,307	181,825	501,658
Treasury stock issued to the 401(k) stock purchase plan (38,943 shares)		38,943		38,943
Approximate cash dividends declared on preferred stock, per share			$ 0.33	$ 0.34	$ 0.67
Cash dividends declared on common stock, per share		$ 0.71	$ 0.71	$ 1.42	$ 1.38