Shareholders' Equity And Earnings Per Share (Components Of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ (34,440)	$ (61,871)	$ (62,708)	$ (37,332)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	925	12,371	25,516	(12,394)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(1,359)	407	(2,094)	633
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	2,295	0	6,707	0
Total other comprehensive income (loss)	1,861	12,778	30,129	(11,761)
Balance at end of period	(32,579)	(49,093)	(32,579)	(49,093)
Accumulated Unrealized Gains (Losses) on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	3,971	(26,333)	(17,674)	(9,533)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	1,532	18,995	20,444	2,499
Amount reclassified from accumulated other comprehensive income (loss), net of tax	(2,005)	60	(3,684)	(244)
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	2,295	0	6,707	0
Total other comprehensive income (loss)	1,822	19,055	23,467	2,255
Balance at end of period	5,793	(7,278)	5,793	(7,278)
Accumulated Unrealized Losses on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(2,220)	(2,727)	(2,193)	(2,517)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	1,037	(287)	66	(1,027)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	646	347	1,590	877
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	0	0
Total other comprehensive income (loss)	1,683	60	1,656	(150)
Balance at end of period	(537)	(2,667)	(537)	(2,667)
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(36,191)	(32,811)	(42,841)	(25,282)
Other comprehensive income (loss) during the period, net of tax, before reclassifications	(1,644)	(6,337)	5,006	(13,866)
Amount reclassified from accumulated other comprehensive income (loss), net of tax	0	0	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	0	0
Total other comprehensive income (loss)	(1,644)	(6,337)	5,006	(13,866)
Balance at end of period	$ (37,835)	$ (39,148)	$ (37,835)	$ (39,148)