Income Taxes (Summary Of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal									$ 16,636	$ 16,846	$ 20,090
State									2,560	2,413	1,436
Total current tax expense									19,196	19,259	21,526
Total deferred tax expense									4,939	(1,244)	14,909
Income tax expense	$ 6,319	$ 6,193	$ 5,813	$ 5,810	$ 2,646	$ 5,606	$ 5,358	$ 4,405	$ 24,135	$ 18,015	$ 36,435