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Parent Only Statements - Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 4,700,366 | $ 4,149,838 | $ 4,616,117 |
Other assets | 36,846 | 52,342 |  |
Total assets | 30,072,110 | 29,169,468 |  |
Liabilities |  |  |  |
Long-term borrowings | 6,440,345 | 5,227,512 |  |
Other liabilities | 403,277 | 407,971 |  |
Total liabilities | 27,912,190 | 27,288,671 |  |
Equity |  |  |  |
Common stock, par value $0.20 per share, 1.125 billion shares authorized: 440.6 million and 438.2 million shares issued, respectively | 88,121 | 87,647 |  |
Additional paid-in capital | 1,193,753 | 1,148,689 |  |
Accumulated other comprehensive loss (net of tax benefit of $(21,209) and $(24,176), respectively) | (65,861) | (75,104) |  |
Retained earnings | 4,114,446 | 3,624,859 |  |
Total SLM Corporation stockholders’ equity before treasury stock | 5,581,529 | 5,037,161 |  |
Less: Common stock held in treasury at cost: 230.2 million and 217.9 million shares, respectively | (3,421,609) | (3,156,364) |  |
Total equity | 2,159,920 | 1,880,797 | 1,726,970 | $ 2,149,711
Total liabilities and equity | $ 30,072,110 | $ 29,169,468 |  |
Preferred stock, par or stated value (in dollars per share) | $ 0.20 | $ 0.20 |  |
Preferred stock, shares authorized (in shares) | 20.0 | 20.0 |  |
Preferred stock liquidation preference (in dollars per share) | $ 100 | $ 100 |  |
Common stock, par value (in dollars per share) | $ 0.20 | $ 0.20 |  |
Common stock, shares authorized (in shares) | 1,125.0 | 1,125.0 |  |
Common stock, shares issued (in shares) | 440.6 | 438.2 |  |
Accumulated other comprehensive income, tax | $ 21,209 | $ 24,176 |  |
Common stock held in treasury (in shares) | 230.2 | 217.9 |  |
Series B Preferred Stock |  |  |  |
Equity |  |  |  |
Preferred stock liquidation preference (in dollars per share) | $ 100 |  |  |
Parent Company |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | $ 391,481 | $ 237,857 | $ 196,820 | $ 570,726
Total investments in subsidiaries (primarily Sallie Mae Bank) | 2,773,211 | 2,628,838 |  |
Due from subsidiaries, net | 43,556 | 63,679 |  |
Other assets | 2,165 | 2,270 |  |
Total assets | 3,210,413 | 2,932,644 |  |
Liabilities |  |  |  |
Long-term borrowings | 995,420 | 992,200 |  |
Income taxes payable, net | 22,440 | 26,701 |  |
Other liabilities | 32,633 | 32,946 |  |
Total liabilities | 1,050,493 | 1,051,847 |  |
Equity |  |  |  |
Common stock, par value $0.20 per share, 1.125 billion shares authorized: 440.6 million and 438.2 million shares issued, respectively | 88,121 | 87,647 |  |
Additional paid-in capital | 1,193,753 | 1,148,689 |  |
Accumulated other comprehensive loss (net of tax benefit of $(21,209) and $(24,176), respectively) | (65,861) | (75,104) |  |
Retained earnings | 4,114,446 | 3,624,859 |  |
Total SLM Corporation stockholders’ equity before treasury stock | 5,581,529 | 5,037,161 |  |
Less: Common stock held in treasury at cost: 230.2 million and 217.9 million shares, respectively | (3,421,609) | (3,156,364) |  |
Total equity | 2,159,920 | 1,880,797 |  |
Total liabilities and equity | $ 3,210,413 | $ 2,932,644 |  |
Preferred stock, par or stated value (in dollars per share) | $ 0.20 | $ 0.20 |  |
Preferred stock, shares authorized (in shares) | 20.0 | 20.0 |  |
Common stock, par value (in dollars per share) | $ 0.20 | $ 0.20 |  |
Common stock, shares authorized (in shares) | 1,125.0 | 1,125.0 |  |
Common stock, shares issued (in shares) | 440.6 | 438.2 |  |
Accumulated other comprehensive income, tax | $ 21,209 | $ (24,176) |  |
Common stock held in treasury (in shares) | 230.2 | 217.9 |  |
Parent Company | Series B Preferred Stock |  |  |  |
Equity |  |  |  |
Series B: 2.5 million and 2.5 million shares issued, respectively, at stated value of $100 per share | $ 251,070 | $ 251,070 |  |
Preferred stock, shares issued (in shares) | 2.5 | 2.5 |  |
Preferred stock liquidation preference (in dollars per share) | $ 100 | $ 100 |  |

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