Shareholders' Equity (Components of Other Comprehensive Income (Loss), Including the Related Income Tax Effects) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ 4,115,995	$ 3,691,250	$ 3,267,570
Other comprehensive income (loss) during the period, net of tax, before reclassification	(30,043)	36,843	50,717
Amount reclassified from accumulated other comprehensive income into net income, net of tax	18,930	13,386	(8,175)
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale	(177)	(169)	(348)
Total other comprehensive (loss) income	(11,290)	50,060	42,194
Balance at end of period	4,498,688	4,115,995	3,691,250
Accumulated Unrealized Gains (Losses) on Securities
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	70,737	14,982	(42,353)
Other comprehensive income (loss) during the period, net of tax, before reclassification	(61,047)	56,086	58,341
Amount reclassified from accumulated other comprehensive income into net income, net of tax	(789)	(162)	(658)
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale	(177)	(169)	(348)
Total other comprehensive (loss) income	(62,013)	55,755	57,335
Balance at end of period	8,724	70,737	14,982
Accumulated Unrealized Gains (Losses) on Derivative Instruments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(23,090)	(13,141)	7,857
Other comprehensive income (loss) during the period, net of tax, before reclassification	30,482	(23,497)	(13,481)
Amount reclassified from accumulated other comprehensive income into net income, net of tax	19,719	13,548	(7,517)
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale	0	0	0
Total other comprehensive (loss) income	50,201	(9,949)	(20,998)
Balance at end of period	27,111	(23,090)	(13,141)
Accumulated Foreign Currency Translation Adjustments
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(32,265)	(36,519)	(42,376)
Other comprehensive income (loss) during the period, net of tax, before reclassification	522	4,254	5,857
Amount reclassified from accumulated other comprehensive income into net income, net of tax	0	0	0
Amount reclassified from accumulated other comprehensive income related to amortization of unrealized gains on investment securities transferred to held-to-maturity from available-for-sale	0	0	0
Total other comprehensive (loss) income	522	4,254	5,857
Balance at end of period	(31,743)	(32,265)	(36,519)
Total Accumulated Other Comprehensive Income (Loss)
Activity Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	15,382	(34,678)	(76,872)
Total other comprehensive (loss) income	(11,290)	50,060	42,194
Balance at end of period	$ 4,092	$ 15,382	$ (34,678)