XML 55 R41.htm IDEA: XBRL DOCUMENT
v3.21.1

Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 21,730,621 | $ 25,258,127
Private Education Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 20,984,491 | $ 23,502,844
Weighted Average Interest Rate | 8.22% | 8.86%
FFELP Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 734,289 | $ 776,326
Weighted Average Interest Rate | 3.41% | 4.29%
Personal Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 0 | $ 973,671
Weighted Average Interest Rate | 0.00% | 12.11%
Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Average Balance | $ 11,841 | $ 5,286
Weighted Average Interest Rate | 0.78% | (4.72%)

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: | num: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: |

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

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