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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Dividends per common share attributable to SLM Corporation (in dollars per share) | $ 0.03 | $ 0
Series B Preferred Stock |  |
Preferred stock dividend rate (in dollars per share) | $ 1.12 | $ 0.83

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