Deposit Accounts - Deposit Accounts and Weighted Average Interest Rates (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Transaction accounts
Noninterest-bearing checking	$ 6,306,825	$ 6,757,259
Interest-bearing checking	3,119,850	3,493,331
Money market	4,946,019	5,387,168
Savings	476,588	419,558
Total transaction accounts	14,849,282	16,057,316
Time deposit accounts
$250,000 or less	525,299	565,272
Greater than $250,000	1,977,820	493,001
Total time deposit accounts	2,503,119	1,058,273
Total deposits	$ 17,352,401	$ 17,115,589
Total transaction accounts
Noninterest-bearing checking (as a percent)	36.40%	39.40%
Interest-bearing checking (as a percent)	18.00%	20.40%
Money market (as a percent)	28.50%	31.50%
Savings (as a percent)	2.70%	2.50%
Total transaction accounts (as a percent)	85.60%	93.80%
Total time deposit accounts
Less than $250,000 (as a percent)	3.00%	3.30%
Greater than $250,000 (as a percent)	11.40%	2.90%
Total time deposit accounts (as a percent)	14.40%	6.20%
Total deposits (as a percent)	100.00%	100.00%
Transaction accounts
Noninterest-bearing checking (as a percent)	0.00%	0.00%
Interest-bearing checking (as a percent)	0.63%	0.02%
Money market (as a percent)	0.85%	0.07%
Savings (as a percent)	0.49%	0.02%
Total transaction accounts (as a percent)	0.43%	0.03%
Time deposit accounts
Less than $250,000 (as a percent)	1.35%	0.29%
Greater than $250,000 (as a percent)	3.37%	0.19%
Total time deposit accounts (as a percent)	2.95%	0.24%
Total deposits (as a percent)	0.79%	0.04%