XML 92 R74.htm IDEA: XBRL DOCUMENT
v3.20.4

Allowance for Credit Losses - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Jul. 01, 2006
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |
Provision for credit losses | $ 121,000 | $ 93,133 |  |  |  |
Additional provisions |  | 290,000 |  |  |  |
Additional provisions related to economic deterioration |  | 129,000 |  |  |  |
Additional provisions related to other adjustments |  | 99,000 |  |  |  |
Reduction to provision for credit losses | 162,000 | 206,000 |  |  |  |
Loans transferred to held-for-sale from held for investment |  | 2,900,000 |  |  |  |
Proceeds from sale of loans receivable | 3,100,000 |  |  |  |  |
Total provision |  | 219,480 | $ (353,934) | $ (244,584) |  |
Loan transfer to held-for-sale |  | $ 2,885,640 | $ 0 |  |  |
Interest rate offered to borrowers facing financial difficulty |  | 4.00% |  |  |  |
Interest rate offered to borrowers facing financial difficulty, period |  | 2 years |  |  |  |
Percentage of loans in full and interest repayment status that are subject to interest rate reductions |  | 7.80% | 7.20% |  |  |
Percentage of loans granted forbearance (as a percentage) |  | 47.00% | 50.00% |  |  |
Criteria for loans to be considered as nonperforming |  | 90 days |  |  |  |
Tier 1 of government guarantee (at least) |  |  |  |  |  | 97.00%
TDR payment default period |  | 60 days |  |  |  |
Period of loans past due that have accrued interest |  | 90 days |  |  |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |
Split Loans portfolio sales price | $ 43,000 |  |  |  | $ 43,000 |
FFELP Loans |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |
Tier 1 of government guarantee (at least) |  | 97.00% |  |  |  |
Private Education Loans |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |
Total provision |  | $ 218,789 | $ (279,570) | $ (169,287) |  |
Maximum |  |  |  |  |  |
Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Line Items] |  |  |  |  |  |
Interest rate offered to borrowers facing financial difficulty |  | 4.00% |  |  |  |

X
- Definition Criteria for loans to be considered as nonperforming. + References No definition available. + Details
Name: | slm_CriteriaForLoansToBeConsideredAsNonperforming
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Credit Loss, Expense (Reversal), Additional Provisions + References No definition available. + Details
Name: | slm_FinancingReceivableCreditLossExpenseReversalAdditionalProvisions
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Credit Loss, Expense (Reversal), Deteriorating Economic Conditions + References No definition available. + Details
Name: | slm_FinancingReceivableCreditLossExpenseReversalDeterioratingEconomicConditions
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Credit Loss, Expense (Reversal), Other Adjustments + References No definition available. + Details
Name: | slm_FinancingReceivableCreditLossExpenseReversalOtherAdjustments
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Financing Receivable, Credit Loss, Expense (Reversal), Reduction + References No definition available. + Details
Name: | slm_FinancingReceivableCreditLossExpenseReversalReduction
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Loans And Leases Receivable, Percentage Of Loans In Full And Interest Repayment Status That Are Subject To Interest Rate Reductions + References No definition available. + Details
Name: | slm_LoansAndLeasesReceivablePercentageOfLoansInFullAndInterestRepaymentStatusThatAreSubjectToInterestRateReductions
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans And Leases Receivable, Period Of Interest Rate Reduction, Financial Difficulty Status + References No definition available. + Details
Name: | slm_LoansAndLeasesReceivablePeriodOfInterestRateReductionFinancialDifficultyStatus
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans And Leases Receivable, Temporary Interest Rate Reduction, Financial Difficulty Status + References No definition available. + Details
Name: | slm_LoansAndLeasesReceivableTemporaryInterestRateReductionFinancialDifficultyStatus
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans and Leases Receivable, Impaired, Loans Granted Forbearance Qualified as Trouble Debt Restructuring + References No definition available. + Details
Name: | slm_LoansandLeasesReceivableImpairedLoansGrantedForbearanceQualifiedasTroubleDebtRestructuring
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payment Default Period For Troubled Debt Restructurings + References No definition available. + Details
Name: | slm_PaymentDefaultPeriodForTroubledDebtRestructurings
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of Loans Past Due That Have Accrued Interest + References No definition available. + Details
Name: | slm_PeriodofLoansPastDueThatHaveAccruedInterest
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Line Items] for Schedule Of Allowance For Credit Losses And Recorded Investment In Financing Receivables Table [Table] + References No definition available. + Details
Name: | slm_ScheduleOfAllowanceForCreditLossesAndRecordedInvestmentInFinancingReceivablesTableLineItems
Namespace Prefix: | slm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tier One of Government Guarantee + References No definition available. + Details
Name: | slm_TierOneofGovernmentGuarantee
Namespace Prefix: | slm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
Name: | us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow associated with the sale of loans receivables arising from the financing of goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfLoansReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of credit loss expense (reversal of expense) for financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(11)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_ProvisionForLoanLossesExpensed
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after valuation allowance, of accounts receivable held for sale and not part of disposal group. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
Name: | us-gaap_TradeReceivablesHeldForSaleNetNotPartOfDisposalGroup
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsDisposedOfBySaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis=slm_FfelpLoansMember
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: |