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Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 617,569 | $ 691,553 |  |
Total cash and cash equivalents | 8,687,276 | 12,028,132 | $ 16,583,000 | $ 10,288,853
Total assets | 50,845,038 | 52,892,376 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 123,127 | 123,069 |  |
Subordinated notes, net of unamortized issuance costs | 99,491 | 99,335 |  |
Accrued interest payable and other liabilities | 844,017 | 866,257 |  |
Total liabilities | 47,128,591 | 49,755,148 |  |
Shareholders’ Equity | 3,716,447 | 3,137,228 | 4,439,555 | 4,293,016
Total liabilities and shareholders’ equity | 50,845,038 | 52,892,376 |  |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 350,525 | 311,944 |  |
Total cash and cash equivalents | 350,525 | 311,944 | $ 471,875 | $ 381,240
Investment in subsidiaries | 3,625,951 | 3,065,114 |  |
Accrued interest receivable and other assets | 1,233 | 1,142 |  |
Total assets | 3,977,709 | 3,378,200 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 123,127 | 123,069 |  |
Subordinated notes, net of unamortized issuance costs | 99,491 | 99,335 |  |
Accrued interest payable and other liabilities | 38,644 | 18,568 |  |
Total liabilities | 261,262 | 240,972 |  |
Shareholders’ Equity | 3,716,447 | 3,137,228 |  |
Total liabilities and shareholders’ equity | $ 3,977,709 | $ 3,378,200 |  |

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