Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ (65,328)	$ (62,708)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	6,121	21,077
Amount reclassified from accumulated other comprehensive income (loss), net of tax	250	(365)
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax	(867)	2,086
Total other comprehensive income	5,504	22,798
Balance at end of period	(59,824)	(39,910)
Accumulated Unrealized Gains (Losses) on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(29,309)	(17,674)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	4,479	15,188
Amount reclassified from accumulated other comprehensive income (loss), net of tax	34	(804)
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax	(867)	2,086
Total other comprehensive income	3,646	16,470
Balance at end of period	(25,663)	(1,204)
Accumulated Unrealized Losses on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	4,165	(2,193)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	765	(149)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	216	439
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax	0	0
Total other comprehensive income	981	290
Balance at end of period	5,146	(1,903)
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(40,184)	(42,841)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	877	6,038
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0
Amount reclassified from accumulated other comprehensive income (loss) related to amortization of unrealized losses on investment securities transferred to held-to-maturity from available-for-sale, net of tax	0	0
Total other comprehensive income	877	6,038
Balance at end of period	$ (39,307)	$ (36,803)