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Derivative Financial Instruments - Summary of Interest Rate Swap Derivatives Designated as Fair Value Accounting Hedges of Fixed-rate Receivables (Detail) - Designated as Hedging Instrument [Member] - Interest Rate Swap [Member] - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 100,000,000 | $ 100,000,000 | $ 100,000,000
Weighted Average Remaining Maturity (years) | 1 year 9 months 18 days | 2 years 7 months 6 days |
Fair Value | $ (1,725,000) | $ (976,000) |
Pay | 4.47% | 4.47% |
Investment, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember | us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember |
Loans [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional Value | $ 100,000,000 | $ 100,000,000 |
Weighted Average Remaining Maturity (years) | 1 year 9 months 18 days | 2 years 7 months 6 days |
Fair Value | $ (1,725,000) | $ (976,000) |
Pay | 4.47% | 4.47% |
Investment, Variable Interest Rate, Type [Extensible Enumeration] | us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember | us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember |

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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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