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Loans Held for Investment - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 01, 2006 | Jun. 30, 2006 | Sep. 30, 1993
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percent of private loans indexed to LIBOR | 54.00% |  | 55.00% |  |  |  |
Tier 1 of government guarantee (at least) | 97.00% |  |  |  | 97.00% |  |
Tier 2 of government guarantee |  |  |  |  |  | 98.00% |
Tier 3 of government guarantee |  |  |  |  |  |  | 100.00%
Gain from sale | $ 399,111 | $ 238,935 |  |  |  |  |
Proceeds from sale of loans receivable | 3,160,000 |  |  |  |  |  |
Net proceeds from sales of loans held for investment, principal | 2,970,000 |  |  |  |  |  |
Net proceeds from sales of loans held for investment, capitalized interest | $ 193,000 |  |  |  |  |  |
Estimated weighted average life of student loans | 4 years 7 months 6 days |  | 5 years 4 months 24 days |  |  |  |
Allowance for credit losses on loans and leases | $ 1,179,021 | 1,673,324 | $ 1,361,723 | $ 441,912 |  |  |
Interest rate reduction | 4.00% |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty, period | 2 years |  |  |  |  |  |
Loans currently in repayment status that were subject to interest rate reductions | 8.10% |  | 7.80% |  |  |  |
Minimum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans expected to have accelerated default rates and increases to loan life | 4.00% |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty | 4.00% |  |  |  |  |  |
Loans expected to have accelerated default rates and increases to loan life | 14.00% |  |  |  |  |  |
Private Education Loan, Extended Loan |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans and leases | $ 784,000 |  |  |  |  |  |
Personal Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans and leases |  | $ 152,673 |  | $ 65,877 |  |  |

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