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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Earnings Per Common Share And Share Awards [Line Items]
Anti-dilutive shares excluded from computation of diluted earnings per share	13	14	13	14
Number of SARs granted where exercise price was less than market price on date of grant			0	0
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value			$ 69.64	$ 59.83
SARs
Earnings Per Common Share And Share Awards [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Net of Forfeitures	5	5	5		5
Share-based Payment Arrangement, Expense			$ 180	$ 139
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount	$ 441		$ 441
Maximum | SARs
Earnings Per Common Share And Share Awards [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award			250
SARs expiration period			7 years
SARs vesting period			5 years

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