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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

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