Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Cash	$ 681,325	$ 722,906
Total cash and cash equivalents	8,874,055	10,234,258	$ 8,687,276	$ 12,028,132
Total assets	53,041,424	52,520,259
Junior subordinated deferrable interest debentures, net of unamortized issuance costs	123,242	123,184
Subordinated notes, net of unamortized issuance costs	99,804	99,648
Accrued interest payable and other liabilities	782,848	1,311,175
Total liabilities	48,468,388	48,621,671
Shareholders’ Equity	4,573,036	3,898,588	3,716,447	3,137,228
Total liabilities and shareholders’ equity	53,041,424	52,520,259
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash	301,154	334,512
Total cash and cash equivalents	301,154	334,512	$ 350,525	$ 311,944
Investment in subsidiaries	4,548,266	3,828,890
Accrued interest receivable and other assets	1,446	1,231
Total assets	4,850,866	4,164,633
Junior subordinated deferrable interest debentures, net of unamortized issuance costs	123,242	123,184
Subordinated notes, net of unamortized issuance costs	99,804	99,648
Accrued interest payable and other liabilities	54,784	43,213
Total liabilities	277,830	266,045
Shareholders’ Equity	4,573,036	3,898,588
Total liabilities and shareholders’ equity	$ 4,850,866	$ 4,164,633