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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ (383,997)	$ (358,325)	$ (341,121)	$ (295,277)	$ (272,123)	$ (251,475)
Loans held for investment, net	23,268,646		22,270,919
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross amount of loans	21,628,847		20,504,465
Deferred origination costs and unamortized premium/(discount)	73,902		68,321
Allowance for loan losses	(307,968)		(277,943)
Loans held for investment, net	21,394,781		20,294,843
Private Education Loans | Fixed-rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross amount of loans	8,231,177		6,759,019
Private Education Loans | Variable-rate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross amount of loans	13,397,670		13,745,446
FFELP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross amount of loans	812,500		846,487
Deferred origination costs and unamortized premium/(discount)	2,262		2,379
Allowance for loan losses	(1,734)		(977)
Loans held for investment, net	813,028		847,889
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross amount of loans	1,134,637		1,190,091
Deferred origination costs and unamortized premium/(discount)	495		297
Allowance for loan losses	(74,295)		(62,201)
Loans held for investment, net	$ 1,060,837		$ 1,128,187

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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