CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$ 47,699us-gaap_ProfitLoss	$ 47,014us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash used in operating activities:
Provision for loan losses	16,618us-gaap_ProvisionForDoubtfulAccounts	39,159us-gaap_ProvisionForDoubtfulAccounts
Tax provision	31,722us-gaap_DeferredIncomeTaxExpenseBenefit	28,658us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of brokered deposit placement fee	2,695	2,750
Amortization of deferred loan origination costs and fees, net	641	298
Net amortization of discount on investments	324us-gaap_AccretionOfDiscount	88us-gaap_AccretionOfDiscount
Depreciation of premises and equipment	1,659us-gaap_Depreciation	1,182us-gaap_Depreciation
Amortization and impairment of acquired intangibles	370us-gaap_AmortizationOfIntangibleAssets	1,767us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation expense	6,140us-gaap_ShareBasedCompensation	7,248us-gaap_ShareBasedCompensation
Unrealized (gains)/losses on derivative and hedging activities, net	(2,417)us-gaap_UnrealizedGainLossOnDerivatives	1,107us-gaap_UnrealizedGainLossOnDerivatives
Gains on sale of loans, net	0	(33,888)
Changes in operating assets and liabilities:
Net decrease in loans held for sale	55	5,426
Origination of loans held for sale	(55)slm_Originationofloansheldforsale	(5,426)slm_Originationofloansheldforsale
Increase in accrued interest receivable	(121,815)	(76,069)
Decrease (increase) in other interest-earning assets	14,900	(21,257)
Decrease in tax indemnification receivable	13,154	0
(Increase) decrease in other assets	(2,079)	3,999
Decrease in income tax payable, net	(23,049)	(122,829)
Increase in accrued interest payable	6,541	3,907
Decrease in payable due to entity that is a subsidiary of Navient	(1,655)	0
(Decrease) increase in other liabilities	(10,629)	(1,381)
Total adjustments	(66,880)	(165,261)
Total net cash used in operating activities	(19,181)	(118,247)
Investing activities
Loans acquired and originated	(1,663,149)slm_StudentLoansacquiredandoriginated	(1,524,455)slm_StudentLoansacquiredandoriginated
Net proceeds from sales of loans held for investment	6,387	679,023
Proceeds from claim payments	46,442slm_ProceedsfromClaimpayments	27,303slm_ProceedsfromClaimpayments
Net decrease in loans held for investment	243,990	183,590
Purchases of available-for-sale securities	(8,178)	(25,190)
Proceeds from sales and maturities of available-for-sale securities	6,630	1,510
Total net cash used in investing activities	(1,367,878)	(658,219)
Financing activities
Net decrease in certificates of deposit	(74,457)	(324,487)
Net (decrease) increase in other deposits	(22,415)slm_NetincreaseinNOWaccountdeposits	135,628slm_NetincreaseinNOWaccountdeposits
Net decrease in deposits with entity that is a subsidiary of Navient	0	(3,631)
Net capital contributions from entity that is a subsidiary of Navient	0	21,230
Excess tax benefit from the exercise of stock-based awards	4,596	0
Preferred stock dividends paid	(4,823)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Net cash provided by financing activities	(97,099)	(171,260)
Net decrease in cash and cash equivalents	(1,484,158)	(947,726)
Cash and cash equivalents at beginning of period	2,359,780	2,182,865
Cash and cash equivalents at end of period	875,622	1,235,139
Cash disbursements made for:
Interest	25,368us-gaap_InterestPaid	16,180us-gaap_InterestPaid
Income taxes paid	$ 17,811us-gaap_IncomeTaxesPaid	$ 99,267us-gaap_IncomeTaxesPaid

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