v3.26.3
Derivative Financial Instruments - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Agreement
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
Agreement
Sep. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
May 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Derivative Instruments, Gain (Loss) [Line Items]              
Description of Conditions Relating to Clearing of Interest rate Swaps     provisions that require the posting of collateral when the fair value of the derivative exceeds certain agreed upon threshold limits        
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net     $ 150,000        
Net Income (Loss) $ 78,098 $ 52,586 177,361 $ 154,254      
Derivative, Gain (Loss) on Derivative, Net     64        
Fair Value Hedging [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Total notional amount of the Company's swaps 700,000   700,000   $ 700,000    
Derivative instruments totaled $ 700,000   $ 700,000   $ 700,000    
Cash Flow Hedging [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Average Interest Rate 4.10%   4.10%        
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value             $ 300,000
Interest Rate Swap Agreements With Customers [Member]              
Derivative Instruments, Gain (Loss) [Line Items]              
Number of interest-rate swap agreements | Agreement 94   94        
Total notional amount of the Company's swaps $ 272,300   $ 272,300        
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%   3.68%     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