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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ (1,929,323)	$ (1,673,324)	$ (441,912)	$ (441,912)	$ (383,997)	$ (358,325)	$ (341,121)
Loans held for investment, net	21,163,931			24,667,792
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Private education loans	21,485,465			23,189,591
Deferred origination costs and unamortized premium/(discount)	67,609			81,224
Allowance for loan losses	(1,760,559)		(374,300)	(374,300)
Loans held for investment, net	19,792,515			22,896,515
Private Education Loans | Fixed-rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Private education loans	9,822,370			9,830,301
Private Education Loans | Variable-rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Private education loans	11,663,095			13,359,290
FFELP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Private education loans	754,340			783,306
Deferred origination costs and unamortized premium/(discount)	2,066			2,143
Allowance for loan losses	(4,385)		(1,633)	(1,633)
Loans held for investment, net	752,021			783,816
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Private education loans	772,086			1,049,007
Deferred origination costs and unamortized premium/(discount)	302			513
Allowance for loan losses	(163,337)		(65,877)	(65,877)
Loans held for investment, net	609,051			983,643
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Private education loans	10,706			3,884
Deferred origination costs and unamortized premium/(discount)	680			36
Allowance for loan losses	(1,042)		$ (102)	(102)
Loans held for investment, net	$ 10,344			$ 3,818

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