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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%