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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Loans in repayment and percentage of each status:        
Allowance for loan losses $ (89,805)us-gaap_LoansAndLeasesReceivableAllowance $ (83,842)us-gaap_LoansAndLeasesReceivableAllowance $ (77,634)us-gaap_LoansAndLeasesReceivableAllowance $ (68,081)us-gaap_LoansAndLeasesReceivableAllowance
Private Education Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in-school/grace/deferment 3,603,478slm_LoanStatusInSchoolGraceAndDefermentRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [1] 3,027,143slm_LoanStatusInSchoolGraceAndDefermentRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [1]    
Loans in forbearance 170,162slm_LoanStatusForbearanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [2] 135,018slm_LoanStatusForbearanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [2]    
Loans in repayment and percentage of each status:        
Loans current 5,896,132us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 5,045,600us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Loans delinquent 31-60 days 54,883us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3] 63,873us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3]    
Loans delinquent 61-90 days 31,202us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3] 29,041us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3]    
Loans delinquent greater than 90 days 12,904us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3] 10,701us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3]    
Total loans in repayment 5,995,121slm_LoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 5,149,215slm_LoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Total loans, gross 9,768,761slm_LoansGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 8,311,376slm_LoansGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Deferred origination costs 17,627slm_NetUnamortizedPremiumOrDiscount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 13,845slm_NetUnamortizedPremiumOrDiscount
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Total loans 9,786,388slm_Loans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 8,325,221slm_Loans
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Allowance for loan losses (85,236)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 (78,574)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 (71,453)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 (61,763)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember
Total loans, net 9,701,152us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 8,246,647us-gaap_LoansReceivableNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Loans current, in percentage 98.40%slm_LoansInRepaymentCurrentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 98.00%slm_LoansInRepaymentCurrentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Loans delinquent 31-60 days, in percentage 0.90%slm_LoansInRepaymentDelinquentThirtyOneToSixtyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3] 1.20%slm_LoansInRepaymentDelinquentThirtyOneToSixtyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3]    
Loans delinquent 61-90 days, in percentage 0.50%slm_LoansInRepaymentDelinquentSixtyOneToNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3] 0.60%slm_LoansInRepaymentDelinquentSixtyOneToNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3]    
Loans delinquent greater than 90 days, in percentage 0.20%slm_LoansInRepaymentDelinquentGreaterThanNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3] 0.20%slm_LoansInRepaymentDelinquentGreaterThanNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 [3]    
Total loans in repayment, in percentage 100.00%slm_LoansInRepaymentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 100.00%slm_LoansInRepaymentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Percentage of loans in repayment 61.40%slm_PercentageOfLoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 62.00%slm_PercentageOfLoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Delinquencies as a percentage of loans in repayment 1.70%slm_DelinquenciesAsPercentageOfLoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 2.00%slm_DelinquenciesAsPercentageOfLoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Loans in forbearance as a percentage of loans in repayment and forbearance 2.80%slm_LoansInForbearanceAsPercentageOfLoansInRepaymentAndForbearance
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		 2.60%slm_LoansInForbearanceAsPercentageOfLoansInRepaymentAndForbearance
/ us-gaap_AccountsNotesLoansAndFinancingReceivablesByIndustryOfCounterpartyTypeAxis
= slm_PrivateEducationLoansMember		    
Troubled Debt Restructured Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans in-school/grace/deferment 1,481slm_LoanStatusInSchoolGraceAndDefermentRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [1] 2,915slm_LoanStatusInSchoolGraceAndDefermentRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [1]    
Loans in forbearance 40,128slm_LoanStatusForbearanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [2] 18,620slm_LoanStatusForbearanceRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [2]    
Loans in repayment and percentage of each status:        
Loans current 73,944us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 34,554us-gaap_FinancingReceivableRecordedInvestmentCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		    
Loans delinquent 31-60 days 3,921us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3] 1,953us-gaap_FinancingReceivableRecordedInvestment30To59DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3]    
Loans delinquent 61-90 days 1,873us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3] 983us-gaap_FinancingReceivableRecordedInvestment60To89DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3]    
Loans delinquent greater than 90 days 773us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3] 377us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3]    
Total loans in repayment 80,511slm_LoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 37,867slm_LoansInRepayment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		    
Total loans, gross $ 122,120slm_LoansGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 $ 59,402slm_LoansGross
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		    
Loans current, in percentage 91.80%slm_LoansInRepaymentCurrentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 91.20%slm_LoansInRepaymentCurrentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		    
Loans delinquent 31-60 days, in percentage 4.90%slm_LoansInRepaymentDelinquentThirtyOneToSixtyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3] 5.20%slm_LoansInRepaymentDelinquentThirtyOneToSixtyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3]    
Loans delinquent 61-90 days, in percentage 2.30%slm_LoansInRepaymentDelinquentSixtyOneToNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3] 2.60%slm_LoansInRepaymentDelinquentSixtyOneToNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3]    
Loans delinquent greater than 90 days, in percentage 1.00%slm_LoansInRepaymentDelinquentGreaterThanNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3] 1.00%slm_LoansInRepaymentDelinquentGreaterThanNinetyDaysInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 [3]    
Total loans in repayment, in percentage 100.00%slm_LoansInRepaymentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		 100.00%slm_LoansInRepaymentInPercentage
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= slm_TroubledDebtRestructuredLoansMember		    
[1] Deferment includes customers who have returned to school or are engaged in other permitted educational activities and are not yet required to make payments on the loans (e.g., residency periods for medical students or a grace period for bar exam preparation).
[2] Loans for customers who have requested extension of grace period generally during employment transition or who have temporarily ceased making full payments due to hardship or other factors, consistent with established loan program servicing policies and procedures.
[3] The period of delinquency is based on the number of days scheduled payments are contractually past due.