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Derivative Financial Instruments - Additional Information (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($) | Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 100,000,000 | $ 100,000,000 | $ 100,000,000
Cash collateral pledged to counterparties as security for its obligations | $ 2,300,000 | $ 2,300,000 |

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