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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Preferred Stock | Treasury Stock | Common Stock | Accumulated Other Comprehensive Income (Loss) | Additional Paid-in Capital | Additional Paid-in Capital Navient's Subsidiary Investment | Retained Earnings | Total SLM Corporation Equity | Non-controlling interest | Series A Preferred Stock | Series A Preferred Stock Retained Earnings | Series A Preferred Stock Total SLM Corporation Equity | Series B Preferred Stock | Series B Preferred Stock Retained Earnings | Series B Preferred Stock Total SLM Corporation Equity
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2012 | $ 1,089,300 |  |  |  | $ 14,348 |  | $ 1,068,928 |  | $ 1,083,276 | $ 6,024 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 257,593 |  |  |  | 0 |  | 258,945 |  | 258,945 | (1,352) |  |  |  |  |  |
Other comprehensive loss, net of tax | (17,372) |  |  |  | (17,372) |  | 0 |  | (17,372) | 0 |  |  |  |  |  |
Comprehensive income | 240,221 |  |  |  |  |  |  |  | 241,573 | (1,352) |  |  |  |  |  |
Net transfers from affiliate | $ (163,378) |  |  |  | 0 |  | (163,378) |  | (163,378) | 0 |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares (in shares) | 9,702,976 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2013 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2013 |  |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2013 | $ 1,166,143 | $ 0 | $ 0 | $ 0 | (3,024) | $ 0 | 1,164,495 | $ 0 | 1,161,471 | 4,672 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 193,785 |  |  |  |  |  | 68,173 | 126,046 | 194,219 | (434) |  |  |  |  |  |
Other comprehensive loss, net of tax | (8,369) |  |  |  | (8,369) |  |  |  | (8,369) |  |  |  |  |  |  |
Comprehensive income | 185,416 |  |  |  |  |  |  |  | 185,850 | (434) |  |  |  |  |  |
Net transfers from affiliate | 479,409 |  |  |  |  |  | 479,409 |  | 479,409 |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation (in shares) |  | 7,300,000 | 0 | 422,790,320 |  |  |  |  |  |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation | 0 | $ 565,000 |  | $ 84,558 |  | 1,062,519 | (1,712,077) |  |  |  |  |  |  |  |  |
Sale of non-controlling interest | (4,238) |  |  |  |  |  |  |  |  | (4,238) |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  | $ (7,667) | $ (7,667) | $ (7,667) | $ (5,266) | $ (5,266) | $ (5,266)
Dividend equivalent units related to employee stock-based compensation plans | $ 0 |  |  |  |  | 47 |  | (47) |  |  |  |  |  |  |  |
Issuance of common shares (in shares) | 2,013,805 |  |  | 2,013,805 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares | $ 8,683 |  |  | $ 403 |  | 8,280 |  |  | 8,683 |  |  |  |  |  |  |
Tax benefit related to employee stock-based compensation | 3,271 |  |  |  |  | 3,271 |  |  | 3,271 |  |  |  |  |  |  |
Stock-based compensation expense | 16,394 |  |  |  |  | 16,394 |  |  | 16,394 |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  | (1,365,277) | (1,365,277) |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans | (12,187) |  | $ (12,187) |  |  |  |  |  | (12,187) |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2014 |  | 7,300,000 |  | 424,804,125 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2014 |  |  | (1,365,277) | 423,438,848 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2014 | 1,829,958 | $ 565,000 | $ (12,187) | $ 84,961 | (11,393) | 1,090,511 | $ 0 | 113,066 | 1,829,958 | $ 0 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 274,284 |  |  |  |  |  |  | 274,284 | 274,284 |  |  |  |  |  |  |
Other comprehensive loss, net of tax | (4,666) |  |  |  | (4,666) |  |  |  | (4,666) |  |  |  |  |  |  |
Comprehensive income | $ 269,618 |  |  |  |  |  |  |  | 269,618 |  |  |  |  |  |  |
Separation adjustments related to Spin-Off of Navient Corporation |  |  |  |  |  | 1,660 |  |  | 1,660 |  |  |  |  |  |  |
Cash dividends: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  |  |  |  |  |  |  |  |  |  | $ (11,501) | $ (11,501) |  | $ (8,094) | $ (8,094) |
Dividend equivalent units related to employee stock-based compensation plans |  |  |  |  |  | 1,146 |  | (1,146) | 0 |  |  |  |  |  |  |
Issuance of common shares (in shares) | 5,873,309 |  |  | 5,873,309 |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common shares |  |  |  | $ 1,175 |  | 14,805 |  |  | 15,980 |  |  |  |  |  |  |
Tax benefit related to employee stock-based compensation |  |  |  |  |  | 6,140 |  |  | 6,140 |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | 21,598 |  |  | 21,598 |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans (in shares) |  |  | (3,008,913) | (3,008,913) |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased related to employee stock-based compensation plans |  |  | $ (29,036) |  |  |  |  |  | (29,036) |  |  |  |  |  |  |
Ending balance, shares issued (in shares) at Dec. 31, 2015 |  | 7,300,000 |  | 430,677,434 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2015 |  |  | (4,374,190) | 426,303,244 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2015 | $ 2,096,323 | $ 565,000 | $ (41,223) | $ 86,136 | $ (16,059) | $ 1,135,860 |  | $ 366,609 | $ 2,096,323 |  |  |  |  |  |  |

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