XML 118 R99.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Arrangements with Navient Corporation Arrangements with Navient Corporation (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2014 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |
Remaining balance of indemnification receivable in connection with the spin-off | $ 27,000,000 |  | $ 24,000,000 |  |
Minimum days past due for spin off loan purchase |  |  | 90 days |  |
Period of hardship forbearance |  |  | 6 months |  |
Gains on sales of loans, net |  |  | $ 2,060,000 | $ 0 | $ 230,000
Interest income from third party |  |  |  | 300,000 | 300,000
Gain (loss) resulting from loans sold |  |  |  | 0 | 0
Write-down to fair value for loans sold to third party |  |  |  | 5,000,000 | 6,000,000
Participated loans |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans sold to third party |  |  |  | $ 12,000,000 | $ 16,000,000
Minimum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Agreements with Navient, period of term (or less) | 1 year |  |  |  |
Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Agreements with Navient, period of term (or less) | 2 years |  |  |  |
Discontinued Operations, Disposed of by Sale |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Principal Amount Outstanding of Loans Held-in-portfolio |  | $ 43,000,000 |  |  |
Gains on sales of loans, net |  | $ 2,000,000 |  |  |

X
- Definition Agreement with Third Party, Contractual Term + References No definition available. + Details
Name: | slm_AgreementwithThirdPartyContractualTerm
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Deferred Tax Assets, Remaining Balance of Indemnification Receivable In Connection with The Spin-Off + References No definition available. + Details
Name: | slm_DeferredTaxAssetsRemainingBalanceofIndemnificationReceivableInConnectionwithTheSpinOff
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Interest Income, Third Party + References No definition available. + Details
Name: | slm_InterestIncomeThirdParty
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans Sold to Third Party + References No definition available. + Details
Name: | slm_LoansSoldtoThirdParty
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Minimum Days Past Due That Company May Require Spin Off Company to Purchase Loans + References No definition available. + Details
Name: | slm_MinimumDaysPastDueThatCompanyMayRequireSpinOffCompanytoPurchaseLoans
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period of Hardship Forbearance + References No definition available. + Details
Name: | slm_PeriodofHardshipForbearance
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Write-Down To Fair Value For Loans Sold To Third party + References No definition available. + Details
Name: | slm_WriteDownToFairValueForLoansSoldToThirdparty
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfLoansAndLeases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reflects the net positive or negative amount derived from subtracting from net proceeds of sale and the carrying amounts, net of allocated reserves, of financial assets transferred to third parties in transactions that qualify for sales treatment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109247956&loc=d3e107425-111719 + Details
Name: | us-gaap_LoansAndLeasesReceivableGainLossOnSalesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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=109247956&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=slm_ParticipatedloansMember
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: |

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

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