Income Taxes (Reconciliation Of Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Computed tax expense at 21%	$ 62,854	$ 96,285	$ 79,394
Tax-exempt interest income	(11,577)	(12,270)	(12,909)
Dividends received deduction	(1,311)	(1,335)	(1,276)
State tax expense (benefit)	2,134	1,678	(869)
Nondeductible expenses	843	983	526
Change in federal tax contingency reserve	0	0	(2,588)
Other, net	(1,573)	(1,447)	(4,296)
Income tax expense	$ 51,370	$ 83,894	$ 57,982