Derivative Financial Instruments (Offsetting Derivatives) (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Asset Derivatives, Fair Value, Less: Master netting agreements	$ 61,395	$ 55,949
Asset derivatives	16,850	42,497
Liability Derivatives, Fair Value, Less: Master netting agreements	61,395	55,949
Liability derivatives	345,998	279,861
Hedge Accounting Positions
Derivative [Line Items]
Asset Derivatives, Fair Value	346,853	289,778
Asset Derivatives, Fair Value, Less: Master netting agreements	61,395	55,949
Asset derivatives	285,297	232,190
Asset derivatives, amounts not offset	161	1,639
Liability Derivatives, Fair Value	61,395	55,949
Liability Derivatives, Fair Value, Less: Master netting agreements	61,395	55,949
Liability derivatives	0	0
Liability derivatives, amounts not offset	$ 0	$ 0