Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Off-Balance-Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)			$ (19,000)
Lessee, Operating Lease, Liability, Payments, Due	$ 8,200	$ 8,400	16,600	$ 16,400
Significant change in expected future minimum lease payments since year end			0
Premises and Equipment
Operating Lease, Right-of-Use Asset	286,500		286,500		$ 288,800
Other Liabilities [Member]
Operating Lease, Liability	$ 320,600		$ 320,600		$ 321,900