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Loans Held for Investment - Student Loan Portfolio by Program (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Private Education Loans $ 9,768,761slm_PrivateEducationLoansGross $ 8,311,376slm_PrivateEducationLoansGross
Deferred origination costs 17,627us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums 13,845us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Allowance for loan losses (85,236)slm_AllowanceForPrivateEducationLoansLosses (78,574)slm_AllowanceForPrivateEducationLoansLosses
Total Private Education Loans, net 9,701,152slm_PrivateEducationLoansNet 8,246,647slm_PrivateEducationLoansNet
FFELP Loans 1,208,977slm_FfelpLoans 1,264,807slm_FfelpLoans
Unamortized acquisition costs, net 3,454slm_Ffelporiginationfeesnet 3,600slm_Ffelporiginationfeesnet
Allowance for loan losses (4,569)slm_FfelpLoanAllowanceForLosses (5,268)slm_FfelpLoanAllowanceForLosses
Total FFELP Loans, net 1,207,862slm_FfelpLoansNet 1,263,139slm_FfelpLoansNet
Loans held for investment, net $ 10,909,014us-gaap_LoansAndLeasesReceivableNetReportedAmount $ 9,509,786us-gaap_LoansAndLeasesReceivableNetReportedAmount