Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ (62,708)	$ (37,332)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	21,077	6,307
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(365)	(66)
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	2,086
Other comprehensive income, net of tax	22,798	6,241
Balance at end of period	(39,910)	(31,091)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(17,674)	(9,533)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	15,188	15,945
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(804)	(318)
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	2,086
Other comprehensive income, net of tax	16,470	15,627
Balance at end of period	(1,204)	6,094
Accumulated Unrealized Losses on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(2,193)	(2,517)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(149)	(593)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	439	252
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
Other comprehensive income, net of tax	290	(341)
Balance at end of period	(1,903)	(2,858)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(42,841)	(25,282)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	6,038	(9,045)
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
Other comprehensive income, net of tax	6,038	(9,045)
Balance at end of period	$ (36,803)	$ (34,327)