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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 443,079 | $ 331,151 | $ 443,599
Stock-based compensation | 12,753 | 13,918 | 15,946
Net tax benefit from stock-based compensation | 7,877 | 852 | 2,447
Net cash provided by (used in) operating activities | 648,293 | 524,243 | 634,090
Net cash provided by (used in) investing activities | (2,525,015) | (1,631,047) | (1,386,750)
Principal payments on long-term borrowings | (13,403) |  |
Redemption of Series A preferred stock | 0 | (150,000) | 0
Proceeds from issuance of Series B preferred stock | 0 | 145,452 | 0
Proceeds from stock option exercises | 54,417 | 12,557 | 20,770
Purchase of treasury stock | (3,864) | (15,785) | (68,793)
Treasury stock issued to 401(k) stock purchase plan | 1,749 | 10,307 | 0
Cash dividends paid on preferred stock | (7,157) | (2,016) | (8,063)
Cash dividends paid on common stock | (188,786) | (180,584) | (177,006)
Net cash provided by (used in) financing activities | 8,170,869 | 7,607,476 | 585,062
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 443,079 | 331,151 | 443,599
Equity in undistributed earnings of subsidiaries | (232,727) | (42,309) | (218,190)
Stock-based compensation | 700 | 770 | 780
Net tax benefit from stock-based compensation | 278 | 370 | 240
Net change in other assets and other liabilities | 23,890 | (8,937) | 22,216
Net cash provided by (used in) operating activities | 235,220 | 281,045 | 248,645
Redemption of investment in non-bank subsidiary | 406 | 0 | 0
Net cash provided by (used in) investing activities | 406 | 0 | 0
Principal payments on long-term borrowings | (13,403) | 0 | 0
Redemption of Series A preferred stock | 0 | (150,000) | 0
Proceeds from issuance of Series B preferred stock | 0 | 145,452 | 0
Proceeds from stock option exercises | 54,417 | 12,557 | 20,770
Proceeds from stock-based compensation activities of subsidiaries | 12,053 | 13,148 | 15,166
Purchase of treasury stock | (3,864) | (15,785) | (68,793)
Treasury stock issued to 401(k) stock purchase plan | 1,749 | 10,307 | 0
Cash dividends paid on preferred stock | (7,157) | (2,016) | (8,063)
Cash dividends paid on common stock | (188,786) | (180,584) | (177,006)
Net cash provided by (used in) financing activities | (144,991) | (166,921) | (217,926)
Net change in cash and cash equivalents | 90,635 | 114,124 | 30,719
Cash and cash equivalents at beginning of year | 381,240 | 267,116 | 236,397
Cash and cash equivalents at end of year | $ 471,875 | $ 381,240 | $ 267,116

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