Deposits (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Balance:
Non-interest-bearing	$ 10,347,006	$ 12,668,160	$ 13,529,277
NOW and interest-bearing demand deposits	6,006,114	5,591,986	5,676,122
Wealth management deposits	1,788,099	2,463,833	2,988,195
Money market	14,478,504	12,886,795	12,538,489
Savings	5,584,294	4,556,635	3,988,790
Time certificates of deposit	6,788,669	4,735,135	4,076,318
Total deposits	$ 44,992,686	$ 42,902,544	$ 42,797,191
Mix:
Non-interest-bearing	23.00%	30.00%	32.00%
NOW and interest-bearing demand deposits	13.00%	13.00%	13.00%
Wealth management deposits	4.00%	5.00%	7.00%
Money market	32.00%	30.00%	29.00%
Savings	13.00%	11.00%	9.00%
Time certificates of deposit	15.00%	11.00%	10.00%
Total deposits	100.00%	100.00%	100.00%