XML 76 R47.htm IDEA: XBRL DOCUMENT v2.4.1.9

Borrowed Funds Borrowed Funds (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Uncommitted Fed Funds	$ 100,000,000slm_UncommittedFederalFunds
Lendable value of collateral	$ 1,361,879,000slm_Lendablevalueofcollateral	$ 1,398,286,000slm_Lendablevalueofcollateral

X

- Definition

Lendable value of collateral

+ References

No definition available.

+ Details

Name:	slm_Lendablevalueofcollateral
Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Uncommitted Federal Funds

+ References

No definition available.

+ Details

Name:	slm_UncommittedFederalFunds
Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration