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Defined Contribution Plans (Details) - Sallie Mae 401(k) Savings Plan - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2013 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Requisite service period | 6 months | 1 month |  |
Type 1 of defined benefit contribution (up to) |  | 3.00% |  |
Type 2 of defined contribution plan |  | 2.00% |  |
Percent of core employer contribution |  | 1.00% |  |
Employer contribution amount |  | $ 4.4 | $ 3.8 | $ 3.1
Maximum |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution percentage |  | 100.00% |  |
Minimum |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Employer matching contribution percentage |  | 50.00% |  |

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- Definition Defined Contribution Plan, Requisite Service Period + References No definition available. + Details
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- Definition Defined Contribution Plan, Requisite Service Period, Core Employer Contribution + References No definition available. + Details
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- Definition Type 1 of Defined Contribution Plan + References No definition available. + Details
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- Definition Type 2 of Defined Contribution Plan + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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- Details
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