Derivative Financial Instruments - Summary of Notional Amounts and Estimated Fair Values of Oil and Gas Derivative Positions Outstanding (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 45,166	$ 8,946
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets	Interest Receivable and Other Assets
Derivative liabilities, Estimated Fair Value	$ (43,856)	$ (8,237)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
Not Designated as Hedging Instrument [Member] | Oil and Gas Swaps and Options [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, Estimated Fair Value	$ 45,166	$ 8,946
Derivative liabilities, Estimated Fair Value	(43,856)	(8,237)
Not Designated as Hedging Instrument [Member] | Oil and Gas Swaps and Options [Member] | Oil [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, Notional Amount	3,463	2,585
Derivative liabilities, Notional Amount	(3,463)	(2,585)
Derivative assets, Estimated Fair Value	18,435	6,563
Derivative liabilities, Estimated Fair Value	(17,684)	(6,129)
Not Designated as Hedging Instrument [Member] | Oil and Gas Swaps and Options [Member] | Gas/Natural Gas Liquids [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, Notional Amount	32,233	19,752
Derivative liabilities, Notional Amount	(32,233)	(19,752)
Derivative assets, Estimated Fair Value	26,731	2,383
Derivative liabilities, Estimated Fair Value	$ (26,172)	$ (2,108)