Deposits (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Balance:
Non-interest-bearing	$ 13,855,844	$ 14,179,980	$ 12,796,110
NOW and interest-bearing demand deposits	5,918,908	4,646,944	3,933,167
Wealth management deposits	3,182,407	2,612,759	2,150,851
Money market	12,273,350	12,840,432	11,784,213
Savings	3,686,596	3,846,681	3,776,400
Time certificates of deposit	3,676,221	3,968,789	4,363,875
Total deposits	$ 42,593,326	$ 42,095,585	$ 38,804,616
Mix:
Non-interest-bearing	33.00%	34.00%	33.00%
NOW and interest-bearing demand deposits	13.00%	11.00%	10.00%
Wealth management deposits	7.00%	6.00%	5.00%
Money market	29.00%	31.00%	30.00%
Savings	9.00%	9.00%	10.00%
Time certificates of deposit	9.00%	9.00%	12.00%
Total deposits	100.00%	100.00%	100.00%