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Allowance for Loan Losses - Modified Loan Accounts for TDR (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Receivables [Abstract] |
Modified Loans | $ 122,120 slm_ModifiedLoans
Charge-offs | 930 slm_ChargeOffsInTDRPortfolio
Payment-Default | $ 4,785 slm_TroubledDebtRestructuringsPaymentDefault

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- 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

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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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- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration