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Investment Securities - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |
Total deposits | $ 12,072,489,000 | $ 12,072,489,000 | $ 11,433,642,000
Investment securities available-for-sale | 2,465,585,000 | 2,465,585,000 | 2,956,125,000
Total deposits | 12,072,489,000 | 12,072,489,000 | 11,433,642,000
Debt securities, held-to-maturity, allowance for credit loss | 0 | 0 | 0
Investment in FHLB stock, impairment losses | 0 | $ 0 |
Debt securities weighted average remaining contractual maturity term |  | 23 years |
Investment Securities-AFS [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Pledged to secure amount | 2,740,000,000 | $ 2,740,000,000 | 2,260,000,000
Total deposits | 1,340,000,000 | 1,340,000,000 | 1,380,000,000
Secure public funds | 469,000,000 | 469,000,000 | 372,500,000
Investment securities available-for-sale | 312,000,000 | 312,000,000 |
Securities Available For Sale Realized Loss | 11,600,000 |  |
Total deposits | 1,340,000,000 | 1,340,000,000 | 1,380,000,000
Outstanding borrowings |  |  | 1,800,000,000
Other purposes | 58,000,000 | 58,000,000 | 51,000,000
Pledged to secure unused borrowing capacity | 1,880,000,000 | 1,880,000,000 | 3,020,000,000.00
Secured unused borrowing capacity | $ 1,350,000,000 | $ 1,350,000,000 | $ 796,000,000
United States [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Securities issued by U.S. government percentage | 90.00% | 90.00% |

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