v3.26.1
Derivatives - Summary of Interest Rate Swap Transactions (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Derivatives Fair Value [Line Items]    
Total Swap assets $ 2,716 $ 3,494
Total Swap liabilities 5,853 5,748
Not Designated as Hedging Instrument [Member]    
Derivatives Fair Value [Line Items]    
Fair Value of total before netting adjustments 5,853 5,674
Fair Value of Netting adjustments - cash collateral posted by counterparties (3,360) (2,180)
Total Swap assets 2,493 3,494
Fair Value of total before netting adjustments 5,853 5,674
Total Swap liabilities 5,853 5,674
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 111,766 114,463
Fair Value Of Interest Rate Swaps With Loan Customers In An Asset Position 2,053 2,792
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 128,065 130,032
Fair Value Of Interest Rate Swaps With Loan Customers In A Liability Position 5,853 5,674
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 239,831 244,495
Fair Value Of Counterparty Positions With Financial Institutions In An Asset Position $ 3,800 $ 2,882