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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