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Commitments and Contingencies - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 13, 2014 | Mar. 31, 2017 | Dec. 31, 2014 | Dec. 31, 2013
Loss Contingencies [Line Items] |  |  |  |
Lawsuit Filing Date |  | May 4, 2015 |  |
Lawsuit settlement date |  | January 26, 2017 |  |
Total reserves established during year |  |  | $ 177,000,000 | $ 177,000,000
Federal Deposit Insurance Corporation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Establishment of a restitution reserve | $ 30,000,000 |  |  |
DOJ Order [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Settlement fund under DOJ |  |  | $ 60,000,000 |
Consent order, term |  |  | 4 years |
Navient Solutions LLC [Member] | Federal Deposit Insurance Corporation [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Civil monetary penalties | $ 3,300,000 |  |  |
Navient Solutions LLC [Member] | DOJ Order [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Civil monetary penalties |  |  | $ 55,000 |
SLM BankCo [Member] | Indemnification Matters [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserve for estimated amounts and costs incurred |  | $ 0 |  |

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