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Deposits - Weighted Average Interest Rates for Each Type of Deposit (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deposits:    
Interest-bearing checking and money market accounts $ 12,610,073 $ 10,230,144
Savings accounts 6,415,608 4,780,007
Certificates of deposit 10,330,680 14,214,858
Non-interest-bearing accounts 3,080,452 2,432,123
Total deposits $ 32,436,813 $ 31,657,132
Percent of Total    
Interest-bearing checking and money market accounts 38.87% 32.32%
Savings accounts 19.78% 15.10%
Certificates of deposit 31.85% 44.90%
Non-interest-bearing accounts 9.50% 7.68%
Total deposits 100.00% 100.00%
Weighted Average Interest Rate    
Interest-bearing checking and money market accounts, weighted average interest rate 0.28% 1.30%
Savings accounts, weighted average interest rate 0.41% 0.75%
Certificates of deposit, weighted average interest rate 0.83% 2.30%
Total deposits, weighted average interest rate 0.45% 1.57%