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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 443,599 | $ 454,918 | $ 364,149
Stock-based compensation | 15,946 | 13,943 | 13,013
Net tax benefit from stock-based compensation | 2,447 | 3,865 | 9,062
Net cash provided by (used in) operating activities | 634,090 | 562,388 | 538,079
Net cash provided by (used in) investing activities | (1,386,750) | (1,913,320) | (670,595)
Proceeds from issuance of subordinated notes | 0 | 0 | 98,434
Principal payments on subordinated notes | 0 | 0 | (100,000)
Proceeds from stock option exercises | 20,770 | 31,647 | 67,746
Purchase of treasury stock | (68,793) | (101,010) | (101,473)
Cash dividends paid on preferred stock | (8,063) | (8,063) | (8,063)
Cash dividends paid on common stock | (177,006) | (165,449) | (144,172)
Net cash provided by (used in) financing activities | 585,062 | 253,664 | 1,044,118
Net change in cash and cash equivalents | (167,598) | (1,097,268) | 911,602
Parent Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 443,599 | 454,918 | 364,149
Equity in undistributed earnings of subsidiaries | (218,190) | (242,485) | (221,440)
Stock-based compensation | 780 | 721 | 519
Net tax benefit from stock-based compensation | 240 | 304 | 318
Net change in other assets and other liabilities | 22,216 | (12,709) | 7,665
Net cash provided by (used in) operating activities | 248,645 | 200,749 | 151,211
Net cash provided by (used in) investing activities | 0 | 0 | 0
Proceeds from issuance of subordinated notes | 0 | 0 | 98,434
Principal payments on subordinated notes | 0 | 0 | 100,000
Proceeds from stock option exercises | 20,770 | 31,647 | 67,746
Proceeds from stock-based compensation activities of subsidiaries | 15,166 | 13,222 | 12,494
Purchase of treasury stock | (68,793) | (101,010) | (101,473)
Cash dividends paid on preferred stock | (8,063) | (8,063) | (8,063)
Cash dividends paid on common stock | (177,006) | (165,449) | (144,172)
Net cash provided by (used in) financing activities | (217,926) | (229,653) | (175,034)
Net change in cash and cash equivalents | 30,719 | (28,904) | (23,823)
Cash and cash equivalents at beginning of year | 236,397 | 265,301 | 289,124
Cash and cash equivalents at end of year | $ 267,116 | $ 236,397 | $ 265,301

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