Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Asset Derivatives, Fair Value, Less: Master netting agreements	$ 52,273	$ 16,129
Asset derivatives	11,914	22,682
Liability Derivatives, Fair Value, Less: Master netting agreements	52,273	16,129
Liability derivatives	381,423	398,370
Hedge Accounting Positions
Derivative [Line Items]
Asset Derivatives, Fair Value	370,140	217,246
Asset Derivatives, Fair Value, Less: Master netting agreements	52,273	16,129
Asset derivatives	311,774	184,095
Asset derivatives, amounts not offset	6,093	17,022
Asset derivatives, net amounts	6,112	17,392
Liability Derivatives, Fair Value	52,273	16,129
Liability Derivatives, Fair Value, Less: Master netting agreements	52,273	16,129
Liability derivatives	0	0
Liability derivatives, amounts not offset	0	0
Liability derivatives, net amounts	$ 3,386	$ 1,545