Parent Company Financial Statements - Condensed Statement of Income (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Expense
Interest on long-term borrowings	$ 62,165	$ 109,332	$ 239,242
Other expense	3,611,623	3,385,240	3,468,682
Income tax credits	(596,403)	(416,369)	(618,112)
Equity in undistributed income of subsidiaries
Net income	$ 1,858,746	$ 1,353,152	$ 1,929,149
Net income per common share
Basic	$ 13.81	$ 9.94	$ 13.76
Diluted	$ 13.80	$ 9.94	$ 13.75
Parent Company [Member]
Income
Dividends from consolidated subsidiaries	$ 1,025,000	$ 708,500	$ 2,025,000
Income from Bayview Lending Group LLC	30,000	52,940	36,740
Other income	2,530	5,110	7,216
Total income	1,057,530	766,550	2,068,956
Expense
Interest on long-term borrowings	24,073	31,924	51,938
Other expense	35,406	33,704	25,236
Total expense	59,479	65,628	77,174
Income before income taxes and equity in undistributed income of subsidiaries	998,051	700,922	1,991,782
Income tax credits	6,052	1,984	8,313
Income before equity in undistributed income of subsidiaries	1,004,103	702,906	2,000,095
Equity in undistributed income of subsidiaries
Net income of subsidiaries	1,879,643	1,358,746	1,954,054
Less: dividends received	(1,025,000)	(708,500)	(2,025,000)
Equity in undistributed income of subsidiaries	854,643	650,246	(70,946)
Net income	$ 1,858,746	$ 1,353,152	$ 1,929,149
Net income per common share
Basic	$ 13.81	$ 9.94	$ 13.76
Diluted	$ 13.80	$ 9.94	$ 13.75