XML 63 R50.htm IDEA: XBRL DOCUMENT
v3.5.0.2

Borrowings - Securitizations (Details) - USD ($) $ in Thousands | May 31, 2016 | Jul. 31, 2015 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Securities Financing Transaction [Line Items] |  |  |  |
Total bonds issued |  |  | $ 501,000 | $ 630,800
Total loan amount securitized at inception on-balance sheet term securitization | $ 619,944 | $ 745,580 |  |
2015-B |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total bonds issued |  | $ 630,800 |  |
Weighted Average Life |  | 4 years 9 months 26 days |  |
2016-A |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Total bonds issued | $ 501,000 |  |  |
Weighted Average Life | 4 years 3 days |  |  |
LIBOR | 2015-B |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Basis spread on variable rate |  | 1.53% |  |
LIBOR | 2016-A |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |
Basis spread on variable rate | 1.38% |  |  |

X
- Definition Debt Instrument, Weighted Average Life + References No definition available. + Details
Name: | slm_DebtInstrumentWeightedAverageLife
Namespace Prefix: | slm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan Amount Securitized + References No definition available. + Details
Name: | slm_LoanAmountSecuritized
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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_SecuritiesFinancingTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_Issuance2015BMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=slm_Issuance2016AMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |