Shareholders' Equity and Other Comprehensive Income (Loss) (Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Net of Income Taxes)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	$ 4,770,130	$ 4,824,635	$ 4,475,801	$ 5,296,800
Total other comprehensive income (loss), net of tax	(105,848)	(364,640)	46,942	(944,384)
Ending balance	4,807,768	4,584,438	4,807,768	4,584,438
Accumulated other comprehensive loss	1,395,175		1,395,175		$ 1,442,117
Total
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(1,289,327)	(662,065)	(1,442,117)	(82,321)
Other comprehensive income (loss) before reclassifications	(138,191)	(363,895)	(14,804)	(941,971)
Amounts reclassified from AOCI	32,343	(745)	61,746	(2,413)
Total other comprehensive income (loss), net of tax	(105,848)	(364,640)	46,942	(944,384)
Ending balance	(1,395,175)	(1,026,705)	(1,395,175)	(1,026,705)
Net unrealized gains (losses) on investment securities available for sale
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(1,105,221)	(542,439)	(1,220,263)	(67,980)
Other comprehensive income (loss) before reclassifications	(82,866)	(327,080)	32,955	(801,539)
Amounts reclassified from AOCI	0	0	(779)	0
Total other comprehensive income (loss), net of tax	(82,866)	(327,080)	32,176	(801,539)
Ending balance	(1,188,087)	(869,519)	(1,188,087)	(869,519)
Accumulated other comprehensive loss	13,300		13,300
Net unrealized gains (losses) on cash flow hedges
Changes in Accumulated Other Comprehensive Income (Loss) by Component [Roll Forward]
Beginning balance	(184,106)	(119,626)	(221,854)	(14,341)
Other comprehensive income (loss) before reclassifications	(55,325)	(36,815)	(47,759)	(140,432)
Amounts reclassified from AOCI	32,343	(745)	62,525	(2,413)
Total other comprehensive income (loss), net of tax	(22,982)	(37,560)	14,766	(142,845)
Ending balance	(207,088)	$ (157,186)	(207,088)	$ (157,186)
Accumulated other comprehensive loss	$ 12,100		$ 12,100