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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 | Jun. 30, 2023 | Dec. 31, 2022
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Derivatives, Fair Value [Line Items] |  |
Derivative assets, Estimated Fair Value | $ 23,340 | $ 20,745
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Interest Receivable and Other Assets | Interest Receivable and Other Assets
Derivative liabilities, Estimated Fair Value | $ (21,813) | $ (19,683)
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 | $ 23,340 | $ 20,745
Derivative liabilities, Estimated Fair Value | (21,813) | (19,683)
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 | 2,416 | 2,698
Derivative liabilities, Notional Amount | (2,416) | (2,698)
Derivative assets, Estimated Fair Value | 11,057 | 8,868
Derivative liabilities, Estimated Fair Value | (10,460) | (8,259)
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 | 53,649 | 25,059
Derivative liabilities, Notional Amount | (53,649) | (25,059)
Derivative assets, Estimated Fair Value | 12,283 | 11,877
Derivative liabilities, Estimated Fair Value | $ (11,353) | $ (11,424)

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