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Derivative Financial Instruments - Summary of Notional Amounts and Estimated Fair Values of Oil and Gas Derivative Positions Outstanding (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Estimated Fair Value | $ 15,881 | $ 10,479
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Interest Receivable and Other Assets | Interest Receivable and Other Assets
Derivative liabilities, Estimated Fair Value | $ (14,396) | $ (9,105)
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other Liabilities | Other Liabilities
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Estimated Fair Value | $ 15,881 | $ 10,479
Derivative liabilities, Estimated Fair Value | (14,396) | (9,105)
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] | Oil [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Notional Amount | 2,591 | 2,404
Derivative liabilities, Notional Amount | (2,591) | (2,404)
Derivative assets, Estimated Fair Value | 10,596 | 7,507
Derivative liabilities, Estimated Fair Value | (9,963) | (6,860)
Not Designated as Hedging Instrument [Member] | Oil and Natural Gas Swaps and Options [Member] | Natural Gas [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets, Notional Amount | 33,048 | 25,561
Derivative liabilities, Notional Amount | (33,048) | (25,561)
Derivative assets, Estimated Fair Value | 5,285 | 2,972
Derivative liabilities, Estimated Fair Value | $ (4,433) | $ (2,245)

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