Summary of Significant Accounting Policies (Additional Cash Flow Information) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Cash paid for interest	$ 616,274	$ 169,020	$ 29,003
Cash paid for income tax	118,000	100,000	39,852
Exchange of real estate	0	0	11,036
Unsettled securities transactions	1,452	94,884	27,032
Loans foreclosed and transferred to other real estate owned and foreclosed assets	0	239	3,464
Right-of-use lease assets obtained in exchange for lessee operating lease liabilities	15,259	31,787	12,854
Treasury stock issued to 401(k) stock purchase plan	$ 0	$ 0	$ 1,749