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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 331,151 | $ 443,599 | $ 454,918
Stock-based compensation | 13,918 | 15,946 | 13,943
Net tax benefit from stock-based compensation | 852 | 2,447 | 3,865
Net cash provided by (used in) operating activities | 524,243 | 634,090 | 562,388
Net cash provided by (used in) investing activities | (1,631,047) | (1,386,750) | (1,913,320)
Redemption of Series A preferred stock | (150,000) | 0 | 0
Proceeds from issuance of Series B preferred stock | 145,452 | 0 | 0
Proceeds from stock option exercises | 12,557 | 20,770 | 31,647
Purchase of treasury stock | (15,785) | (68,793) | (101,010)
Treasury stock issued to 401(k) stock purchase plan | 10,307 | 0 | 0
Cash dividends paid on preferred stock | (2,016) | (8,063) | (8,063)
Cash dividends paid on common stock | (180,584) | (177,006) | (165,449)
Net cash provided by (used in) financing activities | 7,607,476 | 585,062 | 253,664
Net change in cash and cash equivalents | 6,500,672 | (167,598) | (1,097,268)
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 331,151 | 443,599 | 454,918
Equity in undistributed earnings of subsidiaries | (42,309) | (218,190) | (242,485)
Stock-based compensation | 770 | 780 | 721
Net tax benefit from stock-based compensation | 370 | 240 | 304
Net change in other assets and other liabilities | (8,937) | 22,216 | (12,709)
Net cash provided by (used in) operating activities | 281,045 | 248,645 | 200,749
Net cash provided by (used in) investing activities | 0 | 0 | 0
Redemption of Series A preferred stock | (150,000) | 0 | 0
Proceeds from issuance of Series B preferred stock | 145,452 | 0 | 0
Proceeds from stock option exercises | 12,557 | 20,770 | 31,647
Proceeds from stock-based compensation activities of subsidiaries | 13,148 | 15,166 | 13,222
Purchase of treasury stock | (15,785) | (68,793) | (101,010)
Treasury stock issued to 401(k) stock purchase plan | 10,307 | 0 | 0
Cash dividends paid on preferred stock | (2,016) | (8,063) | (8,063)
Cash dividends paid on common stock | (180,584) | (177,006) | (165,449)
Net cash provided by (used in) financing activities | (166,921) | (217,926) | (229,653)
Net change in cash and cash equivalents | 114,124 | 30,719 | (28,904)
Cash and cash equivalents at beginning of year | 267,116 | 236,397 | 265,301
Cash and cash equivalents at end of year | $ 381,240 | $ 267,116 | $ 236,397

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