Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Cash	$ 617,569	$ 691,553
Total cash and cash equivalents	8,687,276	12,028,132	$ 16,583,000	$ 10,288,853
Total assets	50,845,038	52,892,376
Junior subordinated deferrable interest debentures, net of unamortized issuance costs	123,127	123,069
Subordinated notes, net of unamortized issuance costs	99,491	99,335
Accrued interest payable and other liabilities	844,017	866,257
Total liabilities	47,128,591	49,755,148
Shareholders’ Equity	3,716,447	3,137,228	4,439,555	4,293,016
Total liabilities and shareholders’ equity	50,845,038	52,892,376
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	350,525	311,944
Total cash and cash equivalents	350,525	311,944	$ 471,875	$ 381,240
Investment in subsidiaries	3,625,951	3,065,114
Accrued interest receivable and other assets	1,233	1,142
Total assets	3,977,709	3,378,200
Junior subordinated deferrable interest debentures, net of unamortized issuance costs	123,127	123,069
Subordinated notes, net of unamortized issuance costs	99,491	99,335
Accrued interest payable and other liabilities	38,644	18,568
Total liabilities	261,262	240,972
Shareholders’ Equity	3,716,447	3,137,228
Total liabilities and shareholders’ equity	$ 3,977,709	$ 3,378,200