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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 21,238,931 | $ 21,701,229 | $ 23,776,111
Private Education Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 20,576,737 | $ 20,968,061 | $ 22,426,216
Weighted Average Interest Rate | 9.14% | 8.25% | 8.42%
FFELP Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 662,194 | $ 718,186 | $ 757,953
Weighted Average Interest Rate | 4.62% | 3.43% | 3.76%
Personal Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 0 | $ 0 | $ 582,552
Weighted Average Interest Rate | 0.00% | 0.00% | 12.43%
Credit Cards |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Average Balance | $ 0 | $ 14,982 | $ 9,390
Weighted Average Interest Rate | 0.00% | 4.67% | (6.04%)

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