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

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

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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