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Investment Securities - Additional Information (Detail) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, held-to-maturity, allowance for credit loss | $ 0 | $ 0
Debt securities weighted average remaining contractual maturity term | 24 years |
Total deposits | $ 11,984,823 | 11,948,381
United States [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities issued by U.S. government percentage | 90.00% |
Investment Securities-AFS [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Pledged to secure amount | $ 2,700,000 | 2,790,000
Total deposits | 1,090,000 | 1,180,000
Secure public funds | 511,000 | 372,500
Outstanding borrowings |  | 1,800,000
Secured unused borrowing capacity | 1,470,000 | 796,000
Other purposes | 57,000 | 51,000
Pledged to secure unused borrowing capacity | $ 2,030,000 | $ 1,630,000

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