Deposits (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Balance:
Non-interest bearing	$ 10,409,747	$ 7,216,758	$ 7,067,960
NOW and interest-bearing demand deposits	3,294,071	3,093,159	2,966,098
Wealth management deposits	4,235,583	3,123,063	2,795,838
Money market	9,423,653	7,854,189	7,326,899
Savings	3,415,073	3,196,698	2,934,348
Time certificates of deposit	5,066,295	5,623,271	5,619,236
Total deposits	$ 35,844,422	$ 30,107,138	$ 28,710,379
Mix:
Non-interest bearing	29.00%	24.00%	25.00%
NOW and interest-bearing demand deposits	9.00%	10.00%	10.00%
Wealth management deposits	12.00%	10.00%	10.00%
Money market	26.00%	26.00%	25.00%
Savings	10.00%	11.00%	10.00%
Time certificates of deposit	14.00%	19.00%	20.00%
Total deposits	100.00%	100.00%	100.00%