Summary of Significant Accounting Policies (Additional Cash Flow Information) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Cash paid for interest	$ 788,377	$ 616,274	$ 169,020
Cash paid for income tax	122,000	118,000	100,000
Unsettled securities transactions	501,587	1,452	94,884
Loans foreclosed and transferred to other real estate owned and foreclosed assets	19,297	0	239
Right-of-use lease assets obtained in exchange for lessee operating lease liabilities	$ 15,044	$ 15,259	$ 31,787