XML 58 R47.htm IDEA: XBRL DOCUMENT
v3.23.3

Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 21,213,165 | $ 20,614,487 | $ 21,615,968 | $ 21,359,026
Private Education Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 20,649,663 | $ 19,958,763 | $ 21,032,541 | $ 20,685,372
Weighted Average Interest Rate | 10.96% | 9.43% | 10.80% | 8.82%
FFELP Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Average Balance | $ 563,502 | $ 655,724 | $ 583,427 | $ 673,654
Weighted Average Interest Rate | 7.35% | 5.03% | 7.10% | 4.18%

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

X
- Definition Weighted Average Interest Rate On Loans + References No definition available. + Details
Name: | slm_WeightedAverageInterestRateOnLoans
Namespace Prefix: | slm_
Data Type: | dtr-types1:percentItemType
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=slm_PrivateEducationLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FederalFamilyEducationLoanProgramFfelpGuaranteedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |