Deposits (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Balance:
Non-interest-bearing	$ 13,748,918	$ 14,179,980	$ 12,297,337
NOW and interest-bearing demand deposits	4,571,484	4,158,871	3,562,312
Wealth management deposits	5,402,271	4,491,795	4,274,527
Money market	10,671,424	11,449,469	9,236,434
Savings	4,089,230	3,846,681	3,690,892
Time certificates of deposit	3,735,995	3,968,789	4,811,150
Total deposits	$ 42,219,322	$ 42,095,585	$ 37,872,652
Mix:
Non-interest-bearing	32.00%	34.00%	32.00%
NOW and interest-bearing demand deposits	11.00%	10.00%	9.00%
Wealth management deposits	13.00%	11.00%	11.00%
Money market	25.00%	27.00%	25.00%
Savings	10.00%	9.00%	10.00%
Time certificates of deposit	9.00%	9.00%	13.00%
Total deposits	100.00%	100.00%	100.00%