Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Derivative [Line Items]
Asset Derivatives, Fair Value, Less: Master netting agreements	$ 16,877	$ 6,364
Asset derivatives	16,648	133,481
Liability Derivatives, Fair Value, Less: Master netting agreements	16,877	6,364
Liability derivatives	409,900	13,301
Hedge Accounting Positions
Derivative [Line Items]
Asset Derivatives, Fair Value	219,245	25,636
Asset Derivatives, Fair Value, Less: Master netting agreements	16,877	6,364
Asset derivatives	185,968	19,272
Asset derivatives, amounts not offset	16,400	0
Asset derivatives, net amounts	16,771	51
Liability Derivatives, Fair Value	16,877	8,483
Liability Derivatives, Fair Value, Less: Master netting agreements	16,877	6,364
Liability derivatives	0	2,119
Liability derivatives, amounts not offset	0	0
Liability derivatives, net amounts	$ 852	$ 428