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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 597,973 | $ 579,150 | $ 443,079
Stock-based compensation | 24,590 | 18,322 | 12,753
Net tax benefit from stock-based compensation | 894 | 4,602 | 7,877
Net cash provided by (used in) operating activities | 478,845 | 722,582 | 648,293
Net cash provided by (used in) investing activities | (942,751) | (8,277,330) | (2,525,015)
Principal payments on long-term borrowings | 0 | 0 | (13,403)
Proceeds from stock option exercises | 9,299 | 16,659 | 54,417
Purchase of treasury stock | (42,720) | (4,391) | (3,864)
Treasury stock issued to 401(k) stock purchase plan | 0 | 0 | 1,749
Cash dividends paid on preferred stock | (6,675) | (6,675) | (7,157)
Cash dividends paid on common stock | (232,323) | (209,780) | (188,786)
Net cash provided by (used in) financing activities | (2,876,950) | 2,999,880 | 8,170,869
Net change in cash and cash equivalents | (3,340,856) | (4,554,868) | 6,294,147
Cash and cash equivalents at beginning of year | 12,028,132 | 16,583,000 | 10,288,853
Cash and cash equivalents at end of year | 8,687,276 | 12,028,132 | 16,583,000
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 597,973 | 579,150 | 443,079
Equity in undistributed earnings of subsidiaries | (331,761) | (538,439) | (232,727)
Stock-based compensation | 880 | 720 | 700
Net tax benefit from stock-based compensation | 331 | 472 | 278
Net change in other assets and other liabilities | 19,867 | (15,249) | 23,890
Net cash provided by (used in) operating activities | 287,290 | 26,654 | 235,220
Redemption of investment in non-bank subsidiary | 0 | 0 | 406
Net cash provided by (used in) investing activities | 0 | 0 | 406
Principal payments on long-term borrowings | 0 | 0 | (13,403)
Proceeds from stock option exercises | 9,299 | 16,659 | 54,417
Proceeds from stock-based compensation activities of subsidiaries | 23,710 | 17,602 | 12,053
Purchase of treasury stock | (42,720) | (4,391) | (3,864)
Treasury stock issued to 401(k) stock purchase plan | 0 | 0 | 1,749
Cash dividends paid on preferred stock | (6,675) | (6,675) | (7,157)
Cash dividends paid on common stock | (232,323) | (209,780) | (188,786)
Net cash provided by (used in) financing activities | (248,709) | (186,585) | (144,991)
Net change in cash and cash equivalents | 38,581 | (159,931) | 90,635
Cash and cash equivalents at beginning of year | 311,944 | 471,875 | 381,240
Cash and cash equivalents at end of year | $ 350,525 | $ 311,944 | $ 471,875

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