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Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Receivables [Abstract] |  |  |  |
Modified Loans | $ 92,782 | $ 75,183 | $ 153,848 | $ 139,091
Charge-offs | 5,464 | 1,740 | 10,432 | 2,388
Payment-Default | $ 21,388 | $ 8,394 | $ 47,089 | $ 13,177

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

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

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- 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

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