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Investment Securities - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Held-to-maturity, Restricted $ 374,600,000   $ 374,600,000   $ 98,100,000
Debt Securities, Available-for-sale, Restricted $ 850,900,000   $ 850,900,000   386,500,000
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 187   187    
Other Investments and Securities, at Cost $ 6,200,000   $ 6,200,000   6,200,000
Federal Home Loan Bank Stock 18,300,000   18,300,000   44,700,000
Amortized Cost 1,194,858,000   1,194,858,000   1,138,425,000
Debt Securities, Available-for-Sale 1,071,161,000   1,071,161,000   1,020,986,000
Gain (Loss) on Equity Securities $ 5,558,000 $ 0 $ 5,558,000 $ 0  
Expected Class C Visa Shares | shares 5,294   5,294    
Expected Class B-2 Shares | shares 13,340   13,340    
Sales          
Gross Losses     $ 5,535,000 0  
Gross Gains     $ 0 0  
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 $ 922,000   $ 922,000   $ 915,000
Corporate Debt Securities [Member]          
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 10   10   8
Amortized Cost $ 67,133,000   $ 67,133,000   $ 51,886,000
Debt Securities, Available-for-Sale $ 63,291,000   63,291,000   $ 48,412,000
Equity Securities [Member]          
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount     $ 0 $ 0