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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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