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Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items] |  |
Debt securities weighted average remaining contractual maturity term | 25 years |
Total deposits | $ 11,989,921 | $ 11,948,381
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | $ 0 | 0
United States [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Securities issued by U.S. government percentage | 90.00% |
Investment Securities [Member] |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Secured unused borrowing capacity | $ 1,620,000 |
Secure Public Funds | 310,000 | 315
Pledged To Secure Unused Borrowing Capacity |  | 1,630,000
Total deposits | 1,140,000 | 1,180,000
Pledged To Secure | $ 2,710,000 | $ 2,790,000

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