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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (USD $) | Total | Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Total SLM Corporation Equity | Non-controlling interest | Series A Preferred Stock Retained Earnings | Series A Preferred Stock Total SLM Corporation Equity | Series B Preferred Stock Retained Earnings | Series B Preferred Stock Total SLM Corporation Equity | Navient's subsidiary investment Additional Paid-In Capital
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Beginning Balance at Dec. 31, 2013 |  | $ 1,166,143,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  | $ (3,024,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | $ 1,161,471,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 4,672,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | $ 1,164,495,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 47,014,000 us-gaap_ProfitLoss |  |  |  |  |  |  |  | 47,448,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (434,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 47,448,000 us-gaap_ProfitLoss / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Other comprehensive income (loss), net of tax |  | 872,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  |  | 872,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 872,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Comprehensive income |  | 47,886,000 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  |  |  | 48,320,000 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (434,000)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  |
Net transfers (to) from affiliate |  | 17,244,000 slm_NetTransfersToFromAffiliate |  |  |  |  |  |  |  | 17,244,000 slm_NetTransfersToFromAffiliate / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  | 17,244,000 slm_NetTransfersToFromAffiliate / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares (in shares) | [1] | 4,238,182 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2014 |  | 1,231,273,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  | (2,152,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | 1,227,035,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 4,238,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember |  |  |  |  | 1,229,187,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_RestructuringCostAndReserveAxis = us-gaap_SpinoffMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember
Beginning Balance at Dec. 31, 2014 |  | 1,829,958,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 565,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 84,961,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (12,187,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 1,090,511,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (11,393,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | 113,066,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 1,829,958,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Beginning Balance (in shares) at Dec. 31, 2014 |  |  |  | 7,300,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 423,438,848 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,365,277)us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |  |
Beginning Balance, shares issued (in shares) at Dec. 31, 2014 |  |  |  |  | 424,804,125 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | 47,699,000 us-gaap_ProfitLoss |  |  |  |  |  |  | 47,699,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 47,699,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | (9,191,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  |  |  | (9,191,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  | (9,191,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Comprehensive income |  | 38,508,000 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  |  |  | 38,508,000 us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Net transfers (to) from affiliate |  | 0 slm_NetTransfersToFromAffiliate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends, preferred stock |  |  |  |  |  |  |  |  |  |  |  | (2,875,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (2,875,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | (1,948,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (1,948,000)us-gaap_DividendsPreferredStockCash / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |
Dividend equivalent units related to employee stock-based compensation plans |  |  |  |  |  |  | 1,118,000 us-gaap_DividendsShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (1,118,000)us-gaap_DividendsShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 0 us-gaap_DividendsShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Issuance of common shares (in shares) |  | 3,130,839 us-gaap_StockIssuedDuringPeriodSharesNewIssues | [1] |  | 3,130,839 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  |  |  |  | 626,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  | 4,050,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 4,676,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Tax benefit related to employee stock-based compensation |  |  |  |  |  |  | 4,596,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 4,596,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  | 6,140,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 6,140,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  | (1,389,096)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,389,096)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  |  |  |  | (13,142,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | (13,142,000)us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Ending Balance at Mar. 31, 2015 |  | $ 1,865,913,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | $ 565,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | $ 85,587,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (25,329,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 1,106,415,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (20,584,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ 154,824,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 1,865,913,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |  |  |  |  |
Ending Balance (in shares) at Mar. 31, 2015 |  |  |  | 7,300,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_PreferredStockMember | 425,180,591 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (2,754,373)us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |  |  |  |  |  |  |
Ending Balance, shares issued (in shares) at Mar. 31, 2015 |  |  |  |  | 427,934,964 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |  |  |  |  |
[1] | Common shares issued under our various compensation and benefit plans.

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