Deposits (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Balance:
Non-interest bearing	$ 10,204,791	$ 7,216,758	$ 6,719,958
NOW and interest bearing demand deposits	3,440,348	3,093,159	2,788,976
Wealth management deposits	4,433,020	3,123,063	3,220,256
Money market	9,288,976	7,854,189	6,460,098
Savings	3,447,352	3,196,698	2,823,904
Time certificates of deposit	4,837,387	5,623,271	5,505,623
Total deposits	$ 35,651,874	$ 30,107,138	$ 27,518,815
Mix:
Non-interest bearing	29.00%	24.00%	24.00%
NOW and interest bearing demand deposits	10.00%	10.00%	10.00%
Wealth management deposits	12.00%	10.00%	12.00%
Money market	25.00%	26.00%	24.00%
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%