XML 61 R48.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Allowance for Credit Losses - Amortized Cost Basis of Financing Receivables with Loan Modifications (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 4,991 | $ 12,902
% of Total Class of Financing Receivable | 0.02% | 0.06%
Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 252,761 | $ 81,780
% of Total Class of Financing Receivable | 1.13% | 0.35%
Private Education Loans | Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 4,991 | $ 12,902
% of Total Class of Financing Receivable | 0.02% | 0.06%
Private Education Loans | Interest Rate Reduction | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 13.15% | 12.47%
Private Education Loans | Interest Rate Reduction | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 3.94% | 4.00%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans | $ 252,761 | $ 81,780
% of Total Class of Financing Receivable | 1.13% | 0.35%
Weighted average life of loans | 8 years 7 months 2 days | 10 years 2 months 8 days
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 12.57% | 12.74%
Private Education Loans | Combination - Interest Rate Reduction and Term Extension | Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average contractual rate | 3.71% | 4.00%

X
- Definition Financing Receivable, Change in Contractual Rate + References No definition available. + Details
Name: | slm_FinancingReceivableChangeInContractualRate
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Losses, Loan Modifications, Amortized Cost + References No definition available. + Details
Name: | slm_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossesLoanModificationsAmortizedCost
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loan Modifications Made to Borrowers Experiencing Financial Difficulty, Percentage + References No definition available. + Details
Name: | slm_LoanModificationsMadeToBorrowersExperiencingFinancialDifficultyPercentage
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted Average Life of Loans + References No definition available. + Details
Name: | slm_WeightedAverageLifeOfLoans
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_InterestRateBelowMarketReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=slm_InterestRateReductionAndTermExtensionMember
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: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |