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Borrowings - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2024 | May 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |
Funds borrowed under repurchase agreement |  |  | $ 271,642 | $ 565,431
Weighted average interest rates |  |  | 0.29% | 0.11%
Loans Pledged As Collaterals |  |  | $ 4,040,000 |
Borrowing Rate |  |  | 4.65% |
higher cost Borrowings |  |  | $ 2,070,000 |
Short term borrowings |  |  | 995,000 |
Collateral Pledged [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Investment securities at carrying value |  |  | $ 5,290,000 |
Federal Home Loan Bank Advances and Other Borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rates |  |  | 5.70% |
Borrowing Rate |  |  | 4.78% |
higher cost Borrowings |  |  | $ 160,000 |
Maturities of advances BTFP | $ 1,200,000 | $ 695,000 |  |
Short term borrowings |  |  | 2,070,000 |
Short Term Advances |  |  | $ 1,910,000 |

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