XML 47 R40.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Receivables [Abstract] |  |  |  |
Modified Loans | $ 75,183 | $ 4,508 | $ 139,091 | $ 4,508
Charge-offs | 1,740 | 0 | 2,388 | 0
Payment- Default | $ 8,394 | $ 68 | $ 13,177 | $ 68

X
- Definition Charge Offs In TDR Portfolio + References No definition available. + Details
Name: | slm_ChargeOffsInTDRPortfolio
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Modified Loans + References No definition available. + Details
Name: | slm_ModifiedLoans
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Troubled Debt Restructurings Payment Default + References No definition available. + Details
Name: | slm_TroubledDebtRestructuringsPaymentDefault
Namespace Prefix: | slm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration