Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 4,498,688	$ 4,115,995
Other comprehensive (loss) income during the period, net of tax, before reclassifications	(123,803)	(9,994)
Amount reclassified from accumulated other comprehensive income (loss) into net income, net of tax	3,743	4,758
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	(31)	(42)
Total other comprehensive loss	(120,091)	(5,278)
Ending balance	4,492,256	4,252,511
Accumulated Unrealized Gains (Losses) on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	8,724	70,737
Other comprehensive (loss) income during the period, net of tax, before reclassifications	(151,114)	(44,519)
Amount reclassified from accumulated other comprehensive income (loss) into net income, net of tax	(183)	(154)
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	(31)	(42)
Total other comprehensive loss	(151,328)	(44,715)
Ending balance	(142,604)	26,022
Accumulated Unrealized Gains (Losses) on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	27,111	(23,090)
Other comprehensive (loss) income during the period, net of tax, before reclassifications	25,023	32,345
Amount reclassified from accumulated other comprehensive income (loss) into net income, net of tax	3,926	4,912
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	0	0
Total other comprehensive loss	28,949	37,257
Ending balance	56,060	14,167
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(31,743)	(32,265)
Other comprehensive (loss) income during the period, net of tax, before reclassifications	2,288	2,180
Amount reclassified from accumulated other comprehensive income (loss) into net income, net of tax	0	0
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale, net of tax	0	0
Total other comprehensive loss	2,288	2,180
Ending balance	(29,455)	(30,085)
Accumulated other comprehensive income (loss)
Activity Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	4,092	15,382
Total other comprehensive loss	(120,091)	(5,278)
Ending balance	$ (115,999)	$ 10,104