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Loans Held for Investment - Student Loan Portfolio by Program (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
FFELP Loans | $ 846,487 | $ 927,660
Deferred origination costs and unamortized premium/ (discount) | 2,379 | 2,631
Allowance for loan losses | (977) | (1,132)
Total FFELP Loans, net | 847,889 | 929,159
Loans held for investment, net | 22,270,919 | 18,567,641
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, before Fees, Gross | 20,504,465 | 17,432,167
Deferred origination costs and unamortized premium/ (discount) | 68,321 | 56,378
Allowance for loan losses | (277,943) | (243,715)
Total Private Education Loans, net | 20,294,843 | 17,244,830
Personal Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Deferred origination costs and unamortized premium/ (discount) | 297 | 0
Personal Loans (fixed-rate) | 1,190,091 | 400,280
Allowance for loan losses | (62,201) | (6,628)
Total Personal Loans, net | 1,128,187 | 393,652
Fixed Income Interest Rate | Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, before Fees, Gross | 6,759,019 | 4,000,447
Variable Income Interest Rate | Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, before Fees, Gross | $ 13,745,446 | $ 13,431,720

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