XML 101 R77.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Allowance for Credit Losses - Payment Status (Amortized Cost Basis) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | $ 380,526 | $ 326,116
Deferment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 6,843 | 7,698
Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 334,967 | 289,134
30-59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 17,205 | 13,859
60-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 7,689 | 8,809
90 Days or Greater Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 13,822 | 6,616
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 380,526 | 326,116
Private Education Loans | Deferment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 6,843 | 7,698
Private Education Loans | Current |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 334,967 | 289,134
Private Education Loans | 30-59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 17,205 | 13,859
Private Education Loans | 60-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | 7,689 | 8,809
Private Education Loans | 90 Days or Greater Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Payment Status (Amortized Cost Basis) | $ 13,822 | $ 6,616

X
- 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
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
Name: | us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=slm_LoansInSchoolGraceDefermentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis=slm_PrivateEducationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |