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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 579,150 | $ 443,079 | $ 331,151
Stock-based compensation | 18,322 | 12,753 | 13,918
Net tax benefit from stock-based compensation | 4,602 | 7,877 | 852
Net cash provided by (used in) operating activities | 722,582 | 648,293 | 524,243
Net cash provided by (used in) investing activities | (8,277,330) | (2,525,015) | (1,631,047)
Principal payments on long-term borrowings | 0 | (13,403) | 0
Redemption of Series A preferred stock | 0 | 0 | (150,000)
Proceeds from issuance of Series B preferred stock | 0 | 0 | 145,452
Proceeds from stock option exercises | 16,659 | 54,417 | 12,557
Purchase of treasury stock | (4,391) | (3,864) | (15,785)
Treasury stock issued to 401(k) stock purchase plan | 0 | 1,749 | 10,307
Cash dividends paid on preferred stock | (6,675) | (7,157) | (2,016)
Cash dividends paid on common stock | (209,780) | (188,786) | (180,584)
Net cash provided by (used in) financing activities | 2,999,880 | 8,170,869 | 7,607,476
Net change in cash and cash equivalents | (4,554,868) | 6,294,147 | 6,500,672
Cash and cash equivalents at beginning of year | 16,583,000 | 10,288,853 | 3,788,181
Cash and cash equivalents at end of year | 12,028,132 | 16,583,000 | 10,288,853
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 579,150 | 443,079 | 331,151
Equity in undistributed earnings of subsidiaries | (538,439) | (232,727) | (42,309)
Stock-based compensation | 720 | 700 | 770
Net tax benefit from stock-based compensation | 472 | 278 | 370
Net change in other assets and other liabilities | (15,249) | 23,890 | (8,937)
Net cash provided by (used in) operating activities | 26,654 | 235,220 | 281,045
Redemption of investment in non-bank subsidiary | 0 | 406 | 0
Net cash provided by (used in) investing activities | 0 | 406 | 0
Principal payments on long-term borrowings | 0 | (13,403) | 0
Redemption of Series A preferred stock | 0 | 0 | (150,000)
Proceeds from issuance of Series B preferred stock | 0 | 0 | 145,452
Proceeds from stock option exercises | 16,659 | 54,417 | 12,557
Proceeds from stock-based compensation activities of subsidiaries | 17,602 | 12,053 | 13,148
Purchase of treasury stock | (4,391) | (3,864) | (15,785)
Treasury stock issued to 401(k) stock purchase plan | 0 | 1,749 | 10,307
Cash dividends paid on preferred stock | (6,675) | (7,157) | (2,016)
Cash dividends paid on common stock | (209,780) | (188,786) | (180,584)
Net cash provided by (used in) financing activities | (186,585) | (144,991) | (166,921)
Net change in cash and cash equivalents | (159,931) | 90,635 | 114,124
Cash and cash equivalents at beginning of year | 471,875 | 381,240 | 267,116
Cash and cash equivalents at end of year | $ 311,944 | $ 471,875 | $ 381,240

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