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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

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