XML 51 R39.htm IDEA: XBRL DOCUMENT v3.19.2

Loans Held for Investment - Student Loan Portfolio Average Balances (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 23,718,632	$ 20,478,219	$ 23,732,858	$ 20,294,171
Private Education Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 21,748,247	$ 18,764,768	$ 21,740,579	$ 18,712,533
Weighted Average Interest Rate	9.39%	9.03%	9.44%	8.93%
FFELP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 821,138	$ 898,095	$ 829,497	$ 908,846
Weighted Average Interest Rate	5.01%	4.51%	4.98%	4.38%
Personal Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average Balance	$ 1,149,247	$ 815,356	$ 1,162,782	$ 672,792
Weighted Average Interest Rate	12.00%	10.65%	11.90%	10.65%

X

- Definition

Loans and Leases Receivable, before Fees, Gross, Average Balance

+ References

No definition available.

+ Details

Name:	slm_LoansandLeasesReceivablebeforeFeesGrossAverageBalance
Namespace Prefix:	slm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Weighted Average Interest Rate on Loans

+ References

No definition available.

+ Details

Name:	slm_WeightedAverageInterestRateonLoans
Namespace Prefix:	slm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=slm_PrivateEducationLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FederalFamilyEducationLoanProgramFfelpGuaranteedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=slm_PersonalLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: