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Derivative Financial Instruments - Narrative (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral pledged $ 12,053 $ 80
Current net credit exposure 76,300  
Non-performance risk in fair value measurement 4,200 $ 7,600
Cash and Due from Banks    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral pledged 13,800  
CME Swaps Markets    
Derivative Instruments, Gain (Loss) [Line Items]    
Initial margin posted at clearing house 3,500  
Valuation, Cost Approach    
Derivative Instruments, Gain (Loss) [Line Items]    
Cash collateral pledged 84,500  
Valuation, Market Approach    
Derivative Instruments, Gain (Loss) [Line Items]    
Current net credit exposure $ 126,900  
Cash Flow Hedging    
Derivative Instruments, Gain (Loss) [Line Items]    
Maximum time for forecasted transactions 2 years 1 month 6 days