Accumulated Other Comprehensive Income or Loss and Earnings Per Share (Other Comprehensive Income Reclassified from AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains (losses) on investment securities, net	$ 560	$ 250
Income tax expense	63,352	46,289
Interest on deposits	144,802	14,854
Net income	180,198	127,391
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized gains on securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gains (losses) on investment securities, net	560	250
Income before taxes	560	250
Income tax expense	(151)	(67)
Net income	409	183
Reclassification Out of Accumulated Other Comprehensive Income | Accumulated unrealized gains on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes	(3,572)	(5,353)
Income tax expense	952	1,427
Interest on Loans	9,072	0
Interest on deposits	(5,588)	4,819
Interest on other borrowings	88	534
Net income	$ (2,620)	$ (3,926)