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Loans Held for Investment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Mar. 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%			54.00%		55.00%
Tier 1 of government guarantee (at least)	97.00%			97.00%					97.00%
Tier 2 of government guarantee										98.00%
Tier 3 of government guarantee											100.00%
Gain from sale	$ 3,679		$ (369)	$ 402,790	$ 238,566
Proceeds from sale of loans receivable				3,190,000
Net proceeds from sales of loans held for investment, principal	25,000	$ 2,970,000		2,990,000
Net proceeds from sales of loans held for investment, capitalized interest	2,000	193,000		$ 195,000
Estimated weighted average life of student loans				4 years 6 months		5 years 4 months 24 days
Allowance for credit losses on loans and leases	$ 1,160,244	$ 1,179,021	$ 1,929,323	$ 1,160,244	$ 1,929,323	$ 1,361,723	$ 1,673,324	$ 441,912
Interest rate offered to borrowers facing financial difficulty	4.00%			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	9.00%			9.00%		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%			4.00%
Loans expected to have accelerated default rates and increases to loan life				14.00%

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Loans And Leases Receivable, Accelerated Default And Life Of Loan Increase, Percentage

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Loans Subject To Interest Rate Reductions, Percent

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Percent of Private Loans indexed to LIBOR Or SOFR

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Tier One of Government Guarantee

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Tier Three of Government Guarantee

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Tier Two of Government Guarantee

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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