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Investment Securities - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Held-to-maturity, Restricted $ 394,800,000   $ 394,800,000   $ 98,100,000
Debt Securities, Available-for-sale, Restricted $ 895,000,000.0   $ 895,000,000.0   386,500,000
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 156   156    
Other Investments and Securities, at Cost $ 5,700,000   $ 5,700,000   6,200,000
Federal Home Loan Bank Stock 18,900,000   18,900,000   44,700,000
Amortized Cost 1,234,213,000   1,234,213,000   1,138,425,000
Debt Securities, Available-for-Sale 1,140,800,000   1,140,800,000   1,020,986,000
Gain (Loss) on Equity Securities $ 106,000 $ 0 $ 5,664,000 $ 0  
Expected Class C Visa Shares | shares 5,294   5,294    
Expected Class B-2 Shares | shares 13,340   13,340    
Gain Losses Maturities And Impairment $ 88,000 $ (103,000) $ (5,447,000) (103,000)  
Book Value of Available-for-Sale Debt Securities Sold $ 75,100,000   75,100,000    
Sales          
Gross Losses     5,535,000 103,000  
Gross Gains     0 0  
Gain Losses Maturities And Impairment     $ (5,535,000) (103,000)  
US Government-sponsored Enterprises Debt Securities [Member]          
Percent of Unrealized Losses 96.00%   96.00%    
Amortized Cost $ 1,000,000   $ 1,000,000   1,000,000
Debt Securities, Available-for-Sale $ 947,000   $ 947,000   $ 915,000
Corporate Debt Securities [Member]          
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 8   8   8
Amortized Cost $ 62,347,000   $ 62,347,000   $ 51,886,000
Debt Securities, Available-for-Sale $ 60,269,000   60,269,000   $ 48,412,000
Equity Securities [Member]          
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount     $ 0 $ 0