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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.

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