Accumulated Other Comprehensive Income (Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	$ 0	$ 0	$ 312	$ 56
Related income tax expense	(6,250)	(5,098)	(16,877)	(17,151)
Net income available to common shareholders	22,732	20,126	64,694	67,374
Securities available-for-sale: | Amounts reclassified from Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	0	0	312	56
Related income tax expense	0	0	(75)	(12)
Net income available to common shareholders	$ 0	$ 0	$ 237	$ 44