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Derivatives - Summary of Interest Rate Swap Transactions (Detail) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Derivatives Fair Value [Line Items]    
Total Swap assets $ 3,684 $ 5,308
Total Swap liabilities 6,222 11,638
Not Designated as Hedging Instrument [Member]    
Derivatives Fair Value [Line Items]    
Fair Value of total before netting adjustments 6,222 11,638
Fair Value of Netting adjustments - cash collateral posted by counterparties (2,590) (6,330)
Total Swap assets 3,632 5,308
Fair Value of total before netting adjustments 6,222 11,638
Total Swap liabilities 6,222 11,638
Long [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives Fair Value [Line Items]    
Interest Rate Swaps With Loan Customers In An Asset Position Notional Amount 108,393 68,621
Fair Value Of Interest Rate Swaps With Loan Customers In An Asset Position 2,937 1,169
Short [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives Fair Value [Line Items]    
Interest Rate Swaps With Loan Customers In A Liability Position Notional Amount 134,278 179,106
Fair Value Of Interest Rate Swaps With Loan Customers In A Liability Position 6,222 11,638
Short [Member] | Not Designated as Hedging Instrument [Member] | Financial Institutions Asset Position [Member]    
Derivatives Fair Value [Line Items]    
Counterparty Positions With Financial Institutions In An Asset Position Notional Amount 242,672 247,727
Fair Value Of Counterparty Positions With Financial Institutions In An Asset Position $ 3,285 $ 10,469