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Loans Held for Investment - Student Loan Portfolio by Program (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses | $ (1,734,559) | $ (1,929,323) | $ (441,912) | $ (441,912) | $ (414,406) | $ (383,997) | $ (341,121)
Loans held for investment, net | 21,709,771 |  |  | 24,667,792 |  |  |
Private Education Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private education loans | 22,614,327 |  |  | 23,189,591 |  |  |
Deferred origination costs and unamortized premium/(discount) | 70,406 |  |  | 81,224 |  |  |
Allowance for credit losses | (1,728,811) |  | (374,300) | (374,300) |  |  |
Loans held for investment, net | 20,955,922 |  |  | 22,896,515 |  |  |
Private Education Loans | Fixed-rate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private education loans | 10,353,809 |  |  | 9,830,301 |  |  |
Private Education Loans | Variable-rate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private education loans | 12,260,518 |  |  | 13,359,290 |  |  |
FFELP Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private education loans | 745,556 |  |  | 783,306 |  |  |
Deferred origination costs and unamortized premium/(discount) | 2,027 |  |  | 2,143 |  |  |
Allowance for credit losses | (4,363) |  | (1,633) | (1,633) |  |  |
Loans held for investment, net | 743,220 |  |  | 783,816 |  |  |
Personal Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private education loans | 0 |  |  | 1,049,007 |  |  |
Deferred origination costs and unamortized premium/(discount) | 0 |  |  | 513 |  |  |
Allowance for credit losses | 0 |  | (65,877) | (65,877) |  |  |
Loans held for investment, net | 0 |  |  | 983,643 |  |  |
Credit Cards |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Private education loans | 11,540 |  |  | 3,884 |  |  |
Deferred origination costs and unamortized premium/(discount) | 474 |  |  | 36 |  |  |
Allowance for credit losses | (1,385) |  | $ (102) | (102) |  |  |
Loans held for investment, net | $ 10,629 |  |  | $ 3,818 |  |  |

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