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Investment Securities - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Debt Securities, Held-to-maturity, Restricted $ 363,800,000   $ 363,800,000   $ 247,500,000
Debt Securities, Available-for-sale, Restricted $ 679,100,000   $ 679,100,000   580,500,000
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 149   149    
Other Investments and Securities, at Cost $ 5,700,000   $ 5,700,000   5,700,000
Federal Home Loan Bank Stock 35,900,000   35,900,000   25,200,000
Amortized Cost 1,205,127,000   1,205,127,000   1,267,747,000
Debt Securities, Available-for-Sale 1,111,709,000   1,111,709,000   1,147,623,000
Gain (Loss) on Equity Securities 0 $ 5,558,000 5,146,000 $ 5,558,000  
Gain Losses Maturities And Impairment 0 $ (5,535,000) (5,142,000) (5,535,000)  
Book Value of Available-for-Sale Debt Securities Sold $ 53,700,000   53,700,000    
Equity          
Gain (Loss) on Equity Securities       5,700,000  
Sales          
Gross Losses     5,142,000 5,535,000  
Gross Gains     0 0  
Gain Losses Maturities And Impairment     $ (5,142,000) (5,535,000)  
US Government-sponsored Enterprises Debt Securities [Member]          
Percent of Unrealized Losses 97.00%   97.00%    
Amortized Cost $ 1,000,000   $ 1,000,000   1,000,000
Debt Securities, Available-for-Sale $ 968,000   $ 968,000   $ 946,000
Corporate Debt Securities [Member]          
Investment Securities in Unrealized Loss Position, Qualitative Disclosure, Number of Positions, Total 7   7   7
Amortized Cost $ 62,738,000   $ 62,738,000   $ 62,475,000
Debt Securities, Available-for-Sale $ 62,465,000   62,465,000   $ 61,493,000
Equity Securities [Member]          
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount     $ 0 $ 0