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Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Deposit Liability [Line Items]    
Customer deposits $ 259,700 $ 195,900
Certificates of deposit with maturities within 1 year 487,600 500,800
Interest-bearing money market deposits 271,500 226,000
HSA deposits 3,270,000 3,020,000
Short-term deposits 4,288,800 3,942,800
Contractual deposits with maturities greater than 1 year 0 129,800
Total deposits $ 4,288,800 $ 4,072,600
Weighted average cost of HSA deposits outstanding (as a percent) 0.11% 0.11%
Weighted average cost of funds on contractual deposits outstanding (as a percent) 3.98% 3.53%
Weighted average cost of interest-bearing money market deposits outstanding (as a percent) 5.48% 5.47%
Maximum    
Deposit Liability [Line Items]    
Certificates of deposits denominations in dollar amount $ 250 $ 250