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Investment Securities - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | $ 0 | $ 0
Average life of investment grade debt securities, years | 7 years 6 months |
Credit-related impairment loss on investment securities held-to-maturity | $ 0 | 0
Investment in FHLB stock, impairment losses | $ 0 |
Debt securities weighted average remaining contractual maturity term | 25 years |
Total deposits | $ 11,948,381,000 | 11,433,642,000
Investment Securities-AFS [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Pledged to secure amount | 2,790,000,000 | 2,260,000,000
Total deposits | 1,180,000,000 | 1,380,000,000
Pledged to secure unused borrowing capacity |  | 3,020,000,000.00
Debt Instrument, Unused Borrowing Capacity, Amount | 1,630,000,000 | 796,000,000
Secure Public Funds | 315,000,000 | 372,500,000
Outstanding borrowings |  | 1,800,000,000
Pledged to secure unused borrowing capacity | $ 1,630,000,000 | 796,000,000
Other purposes |  | $ 51,000,000
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Average life of investment grade debt securities, years | 12 years |
United States [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities issued by U.S. government percentage | 90.00% |
CMO/REMIC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment contractual cash flows guaranteed by Government, percentage | 100.00% |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total investment portfolio representing municipal bonds, percentage | 9.70% |

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