Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Lease liabilities under operating leases	$ 65,815	$ 67,839
Allowance for credit losses	62,819	64,573
Net actuarial loss on defined benefit post-retirement benefit plans	8,743	13,512
Stock-based compensation	6,989	10,033
Bonus accrual	7,506	3,961
Deferred loan and lease origination fees	3,118	10,252
Other	3,834	3,834
Total gross deferred tax assets	158,824	174,004
Net unrealized gain on securities available for sale and transferred securities	(101,067)	(149,870)
Right-of-use assets under operating leases	(59,415)	(61,963)
Premises and equipment	(49,645)	(49,602)
Intangible assets	(16,595)	(14,596)
Defined benefit post-retirement benefit plans	(11,027)	(10,081)
Partnership interests	0	(2,913)
Leases	(712)	(1,090)
Other	(1,611)	(1,387)
Total gross deferred tax liabilities	(240,072)	(291,502)
Deferred Tax Liabilities, Net	$ (81,248)	$ (117,498)