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Earnings per Common Share (Tables)
3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted A reconciliation of the numerators and denominators of the basic and diluted EPS calculations follows.
Three Months Ended 
 March 31,

(Dollars in thousands, except per share data)
20242023
Numerator:
Net income$289,931 $118,518 
Preferred stock dividends4,653 4,063 
Net income attributable to SLM Corporation common stock$285,278 $114,455 
Denominator:
Weighted average shares used to compute basic EPS220,416 241,497 
Effect of dilutive securities:
Dilutive effect of stock options, restricted stock, restricted stock units, performance stock units, and Employee Stock Purchase Plan (“ESPP”) (1)(2)
3,429 2,052 
Weighted average shares used to compute diluted EPS223,845 243,549 
Basic earnings per common share $1.29 $0.47 
Diluted earnings per common share$1.27 $0.47 


            
(1)     Includes the potential dilutive effect of additional common shares that are issuable upon exercise of outstanding stock options, restricted stock, restricted stock units, performance stock units, and the outstanding commitment to issue shares under the ESPP, determined by the treasury stock method.
(2)      For the three months ended March 31, 2024 and 2023, securities covering approximately 2 million shares and 4 million shares, respectively, were outstanding but not included in the computation of diluted earnings per share because they were anti-dilutive.