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Condensed Financial Statements of Parent Company (Schedule of Condensed Statements of Cash Flows) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Net income (loss) $ 582,542 $ 597,973 $ 579,150
Stock-based compensation 19,763 24,590 18,322
Net tax benefit from stock-based compensation 3,795 894 4,602
Net cash provided by (used in) operating activities 989,532 478,845 722,582
Net cash provided by (used in) investing activities (180,879) (942,751) (8,277,330)
Proceeds from stock option exercises 22,643 9,299 16,659
Purchase of treasury stock (60,901) (42,720) (4,391)
Cash dividends paid on preferred stock (6,675) (6,675) (6,675)
Cash dividends paid on common stock (242,446) (232,323) (209,780)
Net cash provided by (used in) financing activities 738,329 (2,876,950) 2,999,880
Net change in cash and cash equivalents 1,546,982 (3,340,856) (4,554,868)
Cash and cash equivalents at beginning of year 8,687,276 12,028,132 16,583,000
Cash and cash equivalents at end of year 10,234,258 8,687,276 12,028,132
Parent Company [Member]      
Condensed Financial Statements, Captions [Line Items]      
Net income (loss) 582,542 597,973 579,150
Equity in undistributed earnings of subsidiaries (335,724) (331,761) (538,439)
Stock-based compensation 934 880 720
Net tax benefit from stock-based compensation 463 331 472
Net change in other assets and other liabilities 4,322 19,867 (15,249)
Net cash provided by (used in) operating activities 252,537 287,290 26,654
Net cash provided by (used in) investing activities 0 0 0
Proceeds from stock option exercises 22,643 9,299 16,659
Proceeds from stock-based compensation activities of subsidiaries 18,829 23,710 17,602
Purchase of treasury stock (60,901) (42,720) (4,391)
Cash dividends paid on preferred stock (6,675) (6,675) (6,675)
Cash dividends paid on common stock (242,446) (232,323) (209,780)
Net cash provided by (used in) financing activities (268,550) (248,709) (186,585)
Net change in cash and cash equivalents (16,013) 38,581 (159,931)
Cash and cash equivalents at beginning of year 350,525 311,944 471,875
Cash and cash equivalents at end of year $ 334,512 $ 350,525 $ 311,944