Stock-Based Compensation and Directors Stock Purchase Plan (Tables)

12 Months Ended

Dec. 31, 2021

Share-based Payment Arrangement, Noncash Expense [Abstract]

Summary Of The Status Of Nonvested Share Awards

Nonvested Restricted Stock Awards

Nonvested stock is awarded to key employees by action of the Company's Compensation and Human Resources Committee and Board of Directors. These awards generally vest after 4 to 7 years of continued employment, but vesting terms may vary according to the specifics of the individual grant agreement. There are restrictions as to transferability, sale, pledging, or assigning, among others, prior to the end of the vesting period. Dividend and voting rights are conferred upon grant of restricted stock awards. A summary of the status of the Company’s nonvested share awards as of December 31, 2021 and changes during the year then ended is presented below.

	Shares	Weighted Average Grant Date Fair Value
Nonvested at January 1, 2021	1,154,573	$	49.63
Granted	253,422	68.50
Vested	(258,136)	41.49
Forfeited	(29,368)	55.75
Nonvested at December 31, 2021	1,120,491	$	55.58

Summary Of SAR Activity

(Dollars in thousands, except per share data)	Shares	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at January 1, 2021	1,055,767	$	42.81
Granted	75,943	69.44
Forfeited	(8,391)	56.80
Expired	(485)	55.35
Exercised	(226,486)	37.73
Outstanding at December 31, 2021	896,348	$	46.21	5.7	years	$	20,327
Exercisable at December 31, 2021	582,072	$	40.18	4.7	years	$	16,624

Schedule Of Share Based Payment Award Stock Options Valuation Assumptions [Table Text Block]

	2021		2020		2019
Weighted per share average fair value at grant date	$15.98		$9.18		$10.30
Assumptions:
Dividend yield	1.4	%	1.7	%	1.7	%
Volatility	28.2	%	20.2	%	19.8	%
Risk-free interest rate	.7	%	1.0	%	2.6	%
Expected term	5.7 years		5.8 years		6.0 years

Schedule Of Additional Information About Stock Options and SARs Exercises

Additional information about SARs exercised is presented below.

(In thousands)	2021		2020		2019
Intrinsic value of SARs exercised	$	7,664	$	6,278	$	7,109
Tax benefit realized SARs exercised	$	1,488	$	1,252	$	1,385