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Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 529,454 | $ 581,857 |  |
Resell agreements | 775 | 356,374 |  |
Cash and cash equivalents | 10,288,853 | 3,788,181 | $ 3,955,779 | $ 5,053,047
Total assets | 42,391,317 | 34,027,428 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,357 | 136,299 |  |
Subordinated notes, net of unamortized issuance costs | 99,021 | 98,865 |  |
Accrued interest payable and other liabilities | 730,165 | 545,690 |  |
Total liabilities | 38,098,301 | 30,115,760 |  |
Shareholders’ Equity | 4,293,016 | 3,911,668 | $ 3,368,917 | $ 3,297,863
Total liabilities and shareholders’ equity | 42,391,317 | 34,027,428 |  |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 381,240 | 9,116 |  |
Resell agreements | 0 | 258,000 |  |
Cash and cash equivalents | 381,240 | 267,116 |  |
Investment in subsidiaries | 4,155,619 | 3,896,962 |  |
Accrued interest receivable and other assets | 2,164 | 2,545 |  |
Total assets | 4,539,023 | 4,166,623 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,357 | 136,299 |  |
Subordinated notes, net of unamortized issuance costs | 99,021 | 98,865 |  |
Accrued interest payable and other liabilities | 10,629 | 19,791 |  |
Total liabilities | 246,007 | 254,955 |  |
Shareholders’ Equity | 4,293,016 | 3,911,668 |  |
Total liabilities and shareholders’ equity | $ 4,539,023 | $ 4,166,623 |  |

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