CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income (loss)	$ 193,785us-gaap_ProfitLoss	$ 257,593us-gaap_ProfitLoss	$ 215,726us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provisions for loan losses	85,529us-gaap_ProvisionForDoubtfulAccounts	69,339us-gaap_ProvisionForDoubtfulAccounts	66,116us-gaap_ProvisionForDoubtfulAccounts
Valuation allowance on loans held for sale	0	0	275
Deferred tax (benefit) provision	(40,888)us-gaap_DeferredIncomeTaxExpenseBenefit	14,567us-gaap_DeferredIncomeTaxExpenseBenefit	(11,015)us-gaap_DeferredIncomeTaxExpenseBenefit
Amortization of FDIC fees	0slm_AmortizationofFDICfees	1,046slm_AmortizationofFDICfees	3,897slm_AmortizationofFDICfees
Amortization of brokered deposit placement fee	10,164	9,754	8,416
Amortization of deferred loan origination costs and fees, net	1,995	2,199	5,337
Net accretion of discount on investments	633us-gaap_AccretionOfDiscount	(7,187)us-gaap_AccretionOfDiscount	(10,058)us-gaap_AccretionOfDiscount
Depreciation of premises and equipment	6,099us-gaap_Depreciation	5,059us-gaap_Depreciation	6,837us-gaap_Depreciation
Amortization and impairment of acquired intangibles	3,290us-gaap_AmortizationOfIntangibleAssets	3,317us-gaap_AmortizationOfIntangibleAssets	13,125us-gaap_AmortizationOfIntangibleAssets
Stock-based compensation expense	24,971us-gaap_ShareBasedCompensation	15,681us-gaap_ShareBasedCompensation	19,102us-gaap_ShareBasedCompensation
Interest rate swap	1,214us-gaap_UnrealizedGainLossOnDerivatives	(324)us-gaap_UnrealizedGainLossOnDerivatives	5,411us-gaap_UnrealizedGainLossOnDerivatives
Gains on sales of loans held for sale	0us-gaap_GainLossOnSalesOfLoansNet	0us-gaap_GainLossOnSalesOfLoansNet	(167)us-gaap_GainLossOnSalesOfLoansNet
Gains on sale of securities	0us-gaap_GainLossOnSaleOfSecuritiesNet	(63,813)us-gaap_GainLossOnSaleOfSecuritiesNet	(129)us-gaap_GainLossOnSaleOfSecuritiesNet
Gains on sales of loans, net	(121,359)	(196,593)	(235,202)
Changes in operating assets and liabilities:
Net decrease in loans held for sale	6,519	3,628	61,275
Origination of loans held for sale	(6,519)slm_Originationofloansheldforsale	(3,628)slm_Originationofloansheldforsale	(61,275)slm_Originationofloansheldforsale
Increase in accrued interest receivable	(331,014)	(281,856)	(168,146)
(Increase) decrease in other interest-earning assets	(72,928)	97	158
Decrease in tax indemnification receivable	38,820	0	0
Increase in other assets	(24,959)	(2,357)	(7,008)
(Decrease) increase in income tax payable	(221,222)	56,784	88,803
Increase in accrued interest payable	2,985	239	2,095
Increase in payable due to entity that is a subsidiary of Navient	8,764	147,379	96,591
(Decrease) increase in other liabilities	(2,652)	39,096	(614)
Total adjustments	(630,558)	(187,573)	(116,176)
Total net cash (used in) provided by operating activities	(436,773)	70,020	99,550
Investing activities
Student loans acquired and originated	(4,094,790)slm_StudentLoansacquiredandoriginated	(4,387,093)slm_StudentLoansacquiredandoriginated	(4,251,595)slm_StudentLoansacquiredandoriginated
Net proceeds from sales of student loans held for investment	2,001,625	2,546,940	2,789,822
Proceeds from claim payments	127,869slm_ProceedsfromClaimpayments	82,615slm_ProceedsfromClaimpayments	4,219slm_ProceedsfromClaimpayments
Net decrease in loans held for investment	638,321	490,791	460,216
Purchases of available-for-sale securities	(72,049)	(62,097)	(33,053)
Proceeds from sales and maturities of available-for-sale securities	10,653	597,728	27,017
Total net cash used in investing activities	(1,388,371)	(731,116)	(1,003,374)
Financing activities
Brokered deposit placement fee	(15,098)	(12,114)	(16,484)
Net increase in certificates of deposit	340,225	535,456	395,304
Net increase in other deposits	1,207,487slm_NetincreaseinMMDAdeposits	1,126,673slm_NetincreaseinMMDAdeposits	1,109,886slm_NetincreaseinMMDAdeposits
Net decrease in deposits with entity that is a subsidiary of Navient	(5,633)	(126,923)	(12,166)
Special cash contribution from Navient	472,718slm_SpecialCashContributionFromSpinOff	0slm_SpecialCashContributionFromSpinOff	0slm_SpecialCashContributionFromSpinOff
Net capital contributions from entity that is a subsidiary of Navient	12,022	(164,471)	(20,419)
Excess tax benefit from the exercise of stock-based awards	3,271	6,258	891
Preferred stock dividends paid	(12,933)us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends	0us-gaap_PaymentsOfDividends
Dividend paid to entity that is a subsidiary of Navient	0slm_Cashdividendpaidtoparent	(120,000)slm_Cashdividendpaidtoparent	(420,000)slm_Cashdividendpaidtoparent
Net cash provided by financing activities	2,002,059	1,244,879	1,037,012
Net increase in cash and cash equivalents	176,915	583,783	133,188
Cash and cash equivalents at beginning of year	2,182,865	1,599,082	1,465,894
Cash and cash equivalents at end of year	2,359,780	2,182,865	1,599,082
Cash disbursements made for:
Interest	90,329us-gaap_InterestPaid	76,901us-gaap_InterestPaid	75,250us-gaap_InterestPaid
Income taxes paid	401,834us-gaap_IncomeTaxesPaid	81,194us-gaap_IncomeTaxesPaid	47,378us-gaap_IncomeTaxesPaid
Income taxes cash received	$ (3,015)us-gaap_ProceedsFromIncomeTaxRefunds	$ 0us-gaap_ProceedsFromIncomeTaxRefunds	$ 0us-gaap_ProceedsFromIncomeTaxRefunds

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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