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Condensed Financial Statements of Parent Company (Schedule of Condensed Balance Sheets) (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | $ 722,906 | $ 617,569 |  |
Total cash and cash equivalents | 10,234,258 | 8,687,276 | $ 12,028,132 | $ 16,583,000
Total assets | 52,520,259 | 50,845,038 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 123,184 | 123,127 |  |
Subordinated notes, net of unamortized issuance costs | 99,648 | 99,491 |  |
Accrued interest payable and other liabilities | 1,311,175 | 844,017 |  |
Total liabilities | 48,621,671 | 47,128,591 |  |
Shareholders’ Equity | 3,898,588 | 3,716,447 | 3,137,228 | 4,439,555
Total liabilities and shareholders’ equity | 52,520,259 | 50,845,038 |  |
Parent Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash | 334,512 | 350,525 |  |
Total cash and cash equivalents | 334,512 | 350,525 | $ 311,944 | $ 471,875
Investment in subsidiaries | 3,828,890 | 3,625,951 |  |
Accrued interest receivable and other assets | 1,231 | 1,233 |  |
Total assets | 4,164,633 | 3,977,709 |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 123,184 | 123,127 |  |
Subordinated notes, net of unamortized issuance costs | 99,648 | 99,491 |  |
Accrued interest payable and other liabilities | 43,213 | 38,644 |  |
Total liabilities | 266,045 | 261,262 |  |
Shareholders’ Equity | 3,898,588 | 3,716,447 |  |
Total liabilities and shareholders’ equity | $ 4,164,633 | $ 3,977,709 |  |

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