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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for loan losses | $ (441,912) | $ (341,121) | $ (251,475) | $ (184,701)
Loans held for investment, net | 24,667,792 | 22,270,919 |  |
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | 23,189,591 | 20,504,465 |  |
Deferred origination costs and unamortized premium/ (discount) | 81,224 | 68,321 |  |
Allowance for loan losses | (374,300) | (277,943) |  |
Loans held for investment, net | 22,896,515 | 20,294,843 |  |
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | 783,306 | 846,487 |  |
Deferred origination costs and unamortized premium/ (discount) | 2,143 | 2,379 |  |
Allowance for loan losses | (1,633) | (977) |  |
Loans held for investment, net | 783,816 | 847,889 |  |
Personal Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | 1,049,007 | 1,190,091 |  |
Deferred origination costs and unamortized premium/ (discount) | 513 | 297 |  |
Allowance for loan losses | (65,877) | (62,201) |  |
Loans held for investment, net | 983,643 | 1,128,187 |  |
Credit Cards |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | 3,884 | 0 |  |
Deferred origination costs and unamortized premium/ (discount) | 36 | 0 |  |
Allowance for loan losses | (102) | 0 |  |
Loans held for investment, net | 3,818 | 0 |  |
Fixed Income Interest Rate | Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | 9,830,301 | 6,759,019 |  |
Variable Income Interest Rate | Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Private Education Loans | $ 13,359,290 | $ 13,745,446 |  |

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