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Document and Entity Information
Nov. 01, 2021
Document And Entity Information [Line Items]  
Entity Registrant Name SLM Corp
Amendment Flag false
Entity Central Index Key 0001032033
Document Type 8-K
Document Period End Date Nov. 01, 2021
Entity Incorporation State Country Code DE
Entity File Number 001-13251
Entity Tax Identification Number 52-2013874
Entity Address, Address Line One 300 Continental Drive
Entity Address, City or Town Newark
Entity Address, State or Province DE
Entity Address, Postal Zip Code 19713
City Area Code (302)
Local Phone Number 451-0200
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common stock, par value $.20 per share
Trading Symbol SLM
Security Exchange Name NASDAQ
Series B Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Floating Rate Non-Cumulative Preferred Stock, Series B, par value $.20 per share
Trading Symbol SLMBP
Security Exchange Name NASDAQ