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Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 22,575,432 | $ 21,730,621
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 21,858,270 | $ 20,984,491
Weighted Average Interest Rate | 8.38% | 8.22%
FFELP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 690,540 | $ 734,289
Weighted Average Interest Rate | 3.51% | 3.41%
Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 26,622 | $ 11,841
Weighted Average Interest Rate | 3.95% | 0.78%

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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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- 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: |