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Derivative Financial Instruments - Additional Information (Detail)
$ in Thousands
 6 Months Ended 9 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Sep. 30, 2025
USD ($)
Agreement
May 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative assets and liabilities offset in balance sheet     $ 0      
Description of Conditions Relating to Clearing of Interest rate Swaps     These instruments contain language outlining collateral pledging requirements for each counterparty, whereby collateral must be posted if market value exceeds certain agreed upon threshold limits. Cash or securities are pledged as collateral.      
Fair Value Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Total notional amount of the Company's swaps     $ 700,000   $ 300,000  
Derivative Fixed Interest Rate         3.95%  
Average Interest Rate 3.80% 3.80%        
Derivative instruments totaled     10,800      
Remaining Maturity Year 4 years          
Remaining Maturity 5 years 5 years        
Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Average Interest Rate           4.20%
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value     $ 300,000     $ 300,000
Interest Rate Swap Agreements With Customers [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Number of interest-rate swap agreements | Agreement     107      
Total notional amount of the Company's swaps     $ 347,100      
Interest Rate Swaps [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Total notional amount of the Company's swaps $ 1,000,000 $ 1,000,000       $ 300,000
Average Interest Rate 3.80% 3.80%     3.95% 4.20%
Derivative instruments totaled     $ 10,800   $ 300,000 $ 2,800
Remaining Maturity Year   4 years        
Remaining Maturity 5 years 5 years       3 years
Interest Rate Swaps [Member] | Fair Value Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Total notional amount of the Company's swaps       $ 700,000    
Derivative Fixed Interest Rate     3.68% 3.70%    
Interest Rate Swaps [Member] | Cash Flow Hedging [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Total notional amount of the Company's swaps           $ 300,000