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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Unaudited) - USD ($) | Total | Series A Preferred Stock | Series B Preferred Stock | Navient's subsidiary investment | Preferred Stock | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Retained Earnings Series A Preferred Stock | Retained Earnings Series B Preferred Stock | Total SLM Corporation Equity | Total SLM Corporation Equity Series A Preferred Stock | Total SLM Corporation Equity Series B Preferred Stock | Non-controlling interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2013 |  |  |  |  | 0 | 0 | 0 |  |  |  |  |  |  |  |  |
Beginning Balance, shares issued (in shares) at Dec. 31, 2013 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2013 | $ 1,166,143,000 |  |  | $ 1,164,495,000 | $ 0 | $ 0 | $ 0 | $ 0 | $ (3,024,000) | $ 0 |  |  | $ 1,161,471,000 |  |  | $ 4,672,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 91,142,000 |  |  | 68,173,000 |  |  |  |  |  | 23,403,000 |  |  | 91,576,000 |  |  | (434,000)
Other comprehensive income (loss), net of tax | 2,659,000 |  |  |  |  |  |  |  | 2,659,000 |  |  |  | 2,659,000 |  |  |
Comprehensive income | 93,801,000 |  |  |  |  |  |  |  |  |  |  |  | 94,235,000 |  |  | (434,000)
Net transfers (to) from affiliate | 479,409,000 |  |  | 479,409,000 |  |  |  |  |  |  |  |  | 479,409,000 |  |  |
Separation adjustments related to Spin-Off of Navient Corporation (in shares) |  |  |  |  | 7,300,000 | 422,790,320 | 0 |  |  |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation | 0 |  |  | (1,712,077,000) | $ 565,000,000 | $ 84,558,000 |  | 1,062,519,000 |  |  |  |  |  |  |  |
Sale of non-controlling interest | (4,238,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,238,000)
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends, preferred stock |  | $ (1,917,000) | $ (1,311,000) |  |  |  |  |  |  |  | $ (1,917,000) | $ (1,311,000) |  | $ (1,917,000) | $ (1,311,000) |
Dividend equivalent units related to employee stock-based compensation plans | $ 0 |  |  |  |  |  |  | 8,000 |  | (8,000) |  |  |  |  |  |
Issuance of common shares (in shares) | 504,929 |  |  |  |  | 504,929 |  |  |  |  |  |  |  |  |  |
Issuance of common shares | $ 2,445,000 |  |  |  |  | $ 101,000 |  | 2,344,000 |  |  |  |  | 2,445,000 |  |  |
Stock-based compensation expense | 7,045,000 |  |  |  |  |  |  | 7,045,000 |  |  |  |  | 7,045,000 |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  | (358,771) | (358,771) |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | (3,113,000) |  |  |  |  |  | $ (3,113,000) |  |  |  |  |  | (3,113,000) |  |  |
Ending Balance (in shares) at Jun. 30, 2014 |  |  |  |  | 7,300,000 | 422,936,478 | (358,771) |  |  |  |  |  |  |  |  |
Ending Balance, shares issued (in shares) at Jun. 30, 2014 |  |  |  |  |  | 423,295,249 |  |  |  |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2014 | 1,738,264,000 |  |  | $ 0 | $ 565,000,000 | $ 84,659,000 | $ (3,113,000) | 1,071,916,000 | (365,000) | 20,167,000 |  |  | 1,738,264,000 |  |  | $ 0
Beginning Balance (in shares) at Dec. 31, 2014 |  |  |  |  | 7,300,000 | 423,438,848 | (1,365,277) |  |  |  |  |  |  |  |  |
Beginning Balance, shares issued (in shares) at Dec. 31, 2014 |  |  |  |  |  | 424,804,125 |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2014 | 1,829,958,000 |  |  |  | $ 565,000,000 | $ 84,961,000 | $ (12,187,000) | 1,090,511,000 | (11,393,000) | 113,066,000 |  |  | 1,829,958,000 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 138,715,000 |  |  |  |  |  |  |  |  | 138,715,000 |  |  | 138,715,000 |  |  |
Other comprehensive income (loss), net of tax | (55,000) |  |  |  |  |  |  |  | (55,000) |  |  |  | (55,000) |  |  |
Comprehensive income | 138,660,000 |  |  |  |  |  |  |  |  |  |  |  | 138,660,000 |  |  |
Net transfers (to) from affiliate | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends, preferred stock |  |  |  |  |  |  |  |  |  |  | $ (5,750,000) | $ (3,943,000) |  | $ (5,750,000) | $ (3,943,000) |
Dividend equivalent units related to employee stock-based compensation plans |  |  |  |  |  |  |  | 1,121,000 |  | (1,121,000) |  |  | 0 |  |  |
Issuance of common shares (in shares) | 5,208,074 |  |  |  |  | 5,208,074 |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  |  |  |  |  | $ 1,042,000 |  | 12,307,000 |  |  |  |  | 13,349,000 |  |  |
Tax benefit related to employee stock-based compensation |  |  |  |  |  |  |  | 5,774,000 |  |  |  |  | 5,774,000 |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  | 11,210,000 |  |  |  |  | 11,210,000 |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  |  |  |  | (2,764,093) | (2,764,093) |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  |  |  |  |  | $ (27,085,000) |  |  |  |  |  | (27,085,000) |  |  |
Ending Balance (in shares) at Jun. 30, 2015 |  |  |  |  | 7,300,000 | 425,882,829 | (4,129,370) |  |  |  |  |  |  |  |  |
Ending Balance, shares issued (in shares) at Jun. 30, 2015 |  |  |  |  |  | 430,012,199 |  |  |  |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2015 | $ 1,962,173,000 |  |  |  | $ 565,000,000 | $ 86,003,000 | $ (39,272,000) | $ 1,120,923,000 | $ (11,448,000) | $ 240,967,000 |  |  | $ 1,962,173,000 |  |  |

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