Organization and Business	12 Months Ended
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business SLM Corporation (“Sallie Mae,” “SLM,” the “Company,” “we” “our” or “us”) is a holding company that operates through a number of subsidiaries. Its predecessor was formed in 1972 as the Student Loan Marketing Association, a federally-chartered government-sponsored enterprise (the “GSE”), with the goal of furthering access to higher education by providing liquidity to the education loan marketplace. The GSE’s federal charter prohibited it from originating student loans in the primary market. In 1996, the United States Congress passed the Student Loan Marketing Association Reorganization Act, which set the stage for the “privatization” of the GSE. As part of the privatization process, we incorporated SLM Corporation in 1997 as a Delaware corporation, the GSE became a subsidiary of SLM Corporation, and by mid-2004 the GSE stopped purchasing loans insured or guaranteed under the Federal Family Education Loan Program (“FFELP Loans”) in the secondary market and was dissolved by the end of 2004. On November 3, 2005, SLM Corporation formed Sallie Mae Bank, a Utah industrial bank subsidiary (the “Bank”), to fund and originate Private Education Loans on behalf of SLM Corporation. While the Bank first originated Private Education Loans in February 2006, SLM Corporation continued to purchase a portion of its Private Education Loans (hereinafter defined) from its third-party lending partners through mid-2009. With some minor exceptions, the Bank became the sole originator of Private Education Loans for SLM Corporation beginning with the 2009-2010 academic year, the first academic year following the launch of the Bank’s Smart Option Student Loan program in mid-2009. On April 30, 2014, we completed our plan to legally separate into two distinct publicly-traded entities: an education loan management, servicing and asset recovery business, named Navient Corporation (“Navient”), which retained all assets and liabilities generated prior to the Spin-Off (hereinafter defined) other than those explicitly retained by SLM Corporation; and a consumer banking business, named SLM Corporation. The separation of Navient from SLM Corporation (the “Spin-Off”) was preceded by an internal corporate reorganization, which was the first step to separate the education loan management, servicing and asset recovery business from the consumer banking business. As a result of a holding company merger under Section 251(g) of the Delaware General Corporation Law, which is referred to herein as the “SLM Merger,” all of the shares of then existing SLM Corporation’s common stock were converted, on a 1-to-1 basis, into shares of common stock of New BLC Corporation, a newly formed company that was a subsidiary of pre-Spin-Off SLM Corporation (“pre-Spin-Off SLM”), and, pursuant to the SLM Merger, New BLC Corporation replaced then existing SLM Corporation as the publicly-traded registrant and changed its name to SLM Corporation. As part of the internal corporate reorganization, the assets and liabilities associated with the education loan management, servicing and asset recovery business were transferred to Navient, and those assets and liabilities associated with the consumer banking business remained with or were transferred to the newly-constituted SLM Corporation. The separation and distribution were accounted for on a substantially tax-free basis. Our primary business is to originate and service loans we make to students and their families to finance the cost of their education. We use “Private Education Loans” to mean education loans to students or their families that are not made, insured or guaranteed by any state or federal government. Private Education Loans do not include FFELP Loans. The core of our marketing strategy is to generate Private Education Loan originations by promoting our products on campuses through the financial aid offices as well as through online and direct marketing to students and their families. The Bank is regulated by the Utah Department of Financial Institutions (the “UDFI”), the Federal Deposit Insurance Corporation (the “FDIC”) and the Consumer Financial Protection Bureau (the “CFPB”). We also operate Upromise, Inc. (“Upromise”), a save-for-college rewards program helping Americans save for higher education.

Organization and Business

SLM Corporation (“Sallie Mae,” “SLM,” the “Company,” “we” “our” or “us”) is a holding company that operates through a number of subsidiaries. Its predecessor was formed in 1972 as the Student Loan Marketing Association, a federally-chartered government-sponsored enterprise (the “GSE”), with the goal of furthering access to higher education by providing liquidity to the education loan marketplace. The GSE’s federal charter prohibited it from originating student loans in the primary market.

In 1996, the United States Congress passed the Student Loan Marketing Association Reorganization Act, which set the stage for the “privatization” of the GSE. As part of the privatization process, we incorporated SLM Corporation in 1997 as a Delaware corporation, the GSE became a subsidiary of SLM Corporation, and by mid-2004 the GSE stopped purchasing loans insured or guaranteed under the Federal Family Education Loan Program (“FFELP Loans”) in the secondary market and was dissolved by the end of 2004.

On November 3, 2005, SLM Corporation formed Sallie Mae Bank, a Utah industrial bank subsidiary (the “Bank”), to fund and originate Private Education Loans on behalf of SLM Corporation. While the Bank first originated Private Education Loans in February 2006, SLM Corporation continued to purchase a portion of its Private Education Loans (hereinafter defined) from its third-party lending partners through mid-2009. With some minor exceptions, the Bank became the sole originator of Private Education Loans for SLM Corporation beginning with the 2009-2010 academic year, the first academic year following the launch of the Bank’s Smart Option Student Loan program in mid-2009.

On April 30, 2014, we completed our plan to legally separate into two distinct publicly-traded entities: an education loan management, servicing and asset recovery business, named Navient Corporation (“Navient”), which retained all assets and liabilities generated prior to the Spin-Off (hereinafter defined) other than those explicitly retained by SLM Corporation; and a consumer banking business, named SLM Corporation. The separation of Navient from SLM Corporation (the “Spin-Off”) was preceded by an internal corporate reorganization, which was the first step to separate the education loan management, servicing and asset recovery business from the consumer banking business. As a result of a holding company merger under Section 251(g) of the Delaware General Corporation Law, which is referred to herein as the “SLM Merger,” all of the shares of then existing SLM Corporation’s common stock were converted, on a 1-to-1 basis, into shares of common stock of New BLC Corporation, a newly formed company that was a subsidiary of pre-Spin-Off SLM Corporation (“pre-Spin-Off SLM”), and, pursuant to the SLM Merger, New BLC Corporation replaced then existing SLM Corporation as the publicly-traded registrant and changed its name to SLM Corporation. As part of the internal corporate reorganization, the assets and liabilities associated with the education loan management, servicing and asset recovery business were transferred to Navient, and those assets and liabilities associated with the consumer banking business remained with or were transferred to the newly-constituted SLM Corporation. The separation and distribution were accounted for on a substantially tax-free basis.

Our primary business is to originate and service loans we make to students and their families to finance the cost of their education. We use “Private Education Loans” to mean education loans to students or their families that are not made, insured or guaranteed by any state or federal government. Private Education Loans do not include FFELP Loans. The core of our marketing strategy is to generate Private Education Loan originations by promoting our products on campuses through the financial aid offices as well as through online and direct marketing to students and their families. The Bank is regulated by the Utah Department of Financial Institutions (the “UDFI”), the Federal Deposit Insurance Corporation (the “FDIC”) and the Consumer Financial Protection Bureau (the “CFPB”). We also operate Upromise, Inc. (“Upromise”), a save-for-college rewards program helping Americans save for higher education.