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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 22,357,274 | $ 22,575,432
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 21,755,202 | $ 21,858,270
Weighted Average Interest Rate | 10.66% | 8.38%
FFELP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 602,072 | $ 690,540
Weighted Average Interest Rate | 6.87% | 3.51%
Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 0 | $ 26,622
Weighted Average Interest Rate | 0.00% | 3.95%

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- Definition Financing Receivable, Before Allowance For Credit Loss, Average Balance + References No definition available. + Details
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Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Weighted Average Interest Rate on Loans + References No definition available. + Details
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Namespace Prefix: | slm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |