Significant Accounting Policies - Additional Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Accounting Policies [Abstract]
Cash paid for interest	$ 71,848	$ 23,722
Cash paid for income taxes	78,500	28,043
Unsettled securities transactions	470,813	600,874
Loans foreclosed and transferred to other real estate owned and foreclosed assets	0	3,464
Right-of-use lease assets obtained in exchange for lessee operating lease liabilities	23,959	4,045
Treasury stock issued to 401(k) stock purchase plan	$ 0	$ 1,749