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Deposits - Weighted Average Interest Rates for Each Type of Deposit (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deposits: |  |  |
Interest-bearing checking and money market accounts | $ 12,665,002 | $ 12,610,073 | $ 10,230,144
Savings accounts | 7,043,602 | 6,415,608 | 4,780,007
Certificates of deposit | 9,614,298 | 10,330,680 | 14,214,858
Non-interest-bearing accounts | 4,874,234 | 3,080,452 | 2,432,123
Total deposits | $ 34,197,136 | $ 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%

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