Income Taxes (Reconciliation Of The Significant Differences Between The Federal Statutory Income Tax Rate And Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Computed federal taxes at statutory rate									$ 23,351	$ 23,376	$ 23,832
State income taxes, net of federal tax benefit									3,124	2,070	2,376
Tax effects of:
Tax-exempt interest income									(1,177)	(944)	(733)
Bank-owned life insurance									(818)	(929)	(791)
Income tax credits									(1,449)	(1,113)	(889)
Other items, net									83	(743)	340
Income tax expense	$ 6,237	$ 6,250	$ 5,640	$ 4,987	$ 4,565	$ 5,098	$ 4,732	$ 7,322	$ 23,114	$ 21,717	$ 24,135
Effective Income Tax Rate Reconciliation, Percent									20.80%	19.50%	21.30%