Premises and Equipment - Summary of Lease Costs for Operating Leases, Cash Paid Toward Lease Liabilities, and Weighted-Average Remaining Term and Discount Rates of Operating Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Lease cost
Operating lease cost	$ 138,836	$ 101,353	$ 104,158
Short-term lease cost	8,269	111	198
Variable lease cost	3,743	4,103	1,565
Total lease cost	150,848	105,567	105,921
Other information
Right-of-use assets obtained in exchange for new operating lease liabilities	137,998	57,760	70,754
Right-of-use assets acquired in business combination	226,037
Cash paid toward lease liabilities	$ 143,029	$ 106,586	$ 104,396
Weighted-average remaining lease term	7 years	6 years	7 years
Weighted-average discount rate	2.97%	2.51%	2.74%