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Derivatives and Hedging Activities - Summary of Fair Values of Derivative Financial Instruments Classification on Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 10, 2025
Jun. 23, 2025
Dec. 31, 2024
Jul. 12, 2024
Dec. 31, 2023
Nov. 30, 2023
Jun. 30, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative assets, fair value $ 76     $ 114        
Derivative liabilities, fair value 207     114        
Fair Value Hedging [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative assets, fair value [1]       43        
Derivative liabilities, fair value [1] 80              
Cash Flow Hedging [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative liabilities, fair value [1] 51     43        
Derivatives Designated as Hedging Instruments [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative assets, notional amount 60,000     35,000        
Derivative assets, fair value       43        
Derivative liabilities, notional amount 0       $ 10,000      
Derivative liabilities, fair value 131     43        
Interest Rate Contract [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative assets, notional amount $ 50,000     25,000        
Derivative assets, fair value       $ 43        
Derivative Asset, Type [Extensible Enumeration] Other Assets     Other Assets        
Derivative liabilities, notional amount $ 0 $ 25,000 $ 25,000     $ 10,000 $ 25,000 $ 25,000
Derivative liabilities, fair value $ 80              
Derivative Liability, Type [Extensible Enumeration] Other Liabilities              
Interest Rate Contract [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedging [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative assets, notional amount $ 10,000     $ 10,000        
Derivative Asset, Type [Extensible Enumeration] Other Assets     Other Assets        
Derivative liabilities, notional amount $ 0              
Derivative liabilities, fair value $ 51     $ 43        
Derivative Liability, Type [Extensible Enumeration] Other Liabilities     Other Liabilities        
Customer Loan Swaps [Member] | Derivatives Not Designated as Hedging Instruments [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Derivative assets, notional amount $ 4,523     $ 4,630        
Derivative assets, fair value $ 76     $ 71        
Derivative Asset, Type [Extensible Enumeration] Other Assets     Other Assets        
Derivative liabilities, notional amount $ 4,523     $ 4,630        
Derivative liabilities, fair value $ 76     $ 71        
Derivative Liability, Type [Extensible Enumeration] Other Liabilities     Other Liabilities        
[1] Interest rate swap contracts were completed with the same dealer bank. The Company maintains a master netting arrangement with the counterparty and settles collateral on a net basis for all contracts.