Shareholders' Equity And Earnings Per Share (Other Comprehensive Income Reclassified from AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax expense	$ (46,289)	$ (53,711)
Interest on deposits	14,854	27,944
Interest on junior subordinated debentures	1,567	2,704
Net income	127,391	153,148
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
(Losses) gains on investment securities, net	250	210
Income before taxes	250	210
Income tax expense	(67)	(56)
Net income	183	154
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized losses on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes	(5,353)	(6,696)
Income tax expense	1,427	1,784
Interest on deposits	4,819	4,897
Interest on other borrowings	534	669
Interest on junior subordinated debentures	0	1,130
Net income	$ (3,926)	$ (4,912)