XML 61 R49.htm IDEA: XBRL DOCUMENT
v3.22.1

Allowance for Credit Losses - Payment Status (Amortized Cost Basis) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | $ 290
Deferment |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 649
Current |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 84,992
30-59 Days Past Due |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 1,295
60-89 Days Past Due |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 255
90 Days or Greater Past Due |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 85
Private Education Loans |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 290
Private Education Loans | Deferment |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 649
Private Education Loans | Current |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 84,992
Private Education Loans | 30-59 Days Past Due |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 1,295
Private Education Loans | 60-89 Days Past Due |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | 255
Private Education Loans | 90 Days or Greater Past Due |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Payment Status (Amortized Cost Basis) | $ 85

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 Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + 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: |